defineProperty<\/code> \u76d1\u542c\u8303\u56f4\u6bd4\u8f83\u7a84\uff0c\u517c\u5bb9\u6027\u8f83\u597d\uff0cVUE2.0<\/li>\nProxy<\/code> \u76d1\u542c\u8303\u56f4\u5e7f\uff0c\u6240\u6709\u5bf9\u8c61\u7684\u5185\u90e8\u65b9\u6cd5\u90fd\u53ef\u4ee5\u76d1\u542c\uff0c\u4f46\u4ec5\u652f\u6301\u652f\u6301ES6\u7684\u6d4f\u89c8\u5668\uff0cVUE3.0
\n\u56e0\u6b64\uff0c\u6570\u636e\u90fd\u9700\u4e3a\u5bf9\u8c61<\/li>\n<\/ul>\n\/\/ reactive.js\nimport { track, trigger } from '.\/effect.js';\n\/\/ \u5c06\u4e00\u4e2a\u6570\u636e\u53d8\u4e3a\u54cd\u5e94\u5f0f\u6570\u636e\nexport function reactive(target) {\n return new Proxy(target, {\n get(target, key) {\n \/\/ \u4f9d\u8d56\u6536\u96c6\uff1a\u627e\u5230\u5f53\u524dkey\u5bf9\u5e94\u7684\u4f9d\u8d56\n track(target, key);\n \/\/ \u8fd4\u56de\u503c\n return Reflect.get(target, key);\n },\n set(target, key, value) {\n \/\/ \u6d3e\u53d1\u66f4\u65b0\n trigger(target, key);\n \/\/ \u8bbe\u7f6e\u503c\n return Reflect.set(target, key, value);\n }\n });\n}\n<\/code><\/pre>\nreactive\u51fd\u6570\u5c06\u6570\u636e\u53d8\u4e3a\u54cd\u5e94\u5f0f\u6570\u636e<\/p>\n
\/\/ effect.js\n\n\/\/ Description: \u4f9d\u8d56\u6536\u96c6\nexport function track(target, key) {\n \/\/ \u4f9d\u8d56\u6536\u96c6\n console.log(`%c\u4f9d\u8d56\u6536\u96c6\uff1a${key}`, 'color: red');\n}\n\n\/\/ Description: \u6d3e\u53d1\u66f4\u65b0\nexport function trigger(target, key) {\n \/\/ \u6d3e\u53d1\u66f4\u65b0\n console.log(`%c\u6d3e\u53d1\u66f4\u65b0\uff1a${key}`, 'color: blue');\n}\n<\/code><\/pre>\n\u6d4b\u8bd5<\/h2>\n\/\/ index.js\nimport { reactive } from ".\/reactive.js";\n\nconst state = reactive({\n harvester: 2,\n builder: 5,\n upgrader: 5\n});\n\nfunction fn() {\n state.harvester;\n state.builder;\n}\n\nfn();\n\nstate.upgrader = 3;\nstate.builder--; \/\/ (*)\n<\/code><\/pre>\n\u7ed3\u679c\u5982\u4e0b\uff1a
\n
![\"Pasted](\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\")
<\/div>
\nfn \u4e2d\u5f15\u7528\u4e86 harvester \u548c builder \u89e6\u53d1\u4e86\u4f9d\u8d56\u6536\u96c6\u3002
\n\u66f4\u6539upgrader\u7684\u503c\u89e6\u53d1\u4e86\u6d3e\u53d1\u66f4\u65b0\u3002<\/p>\n\n(*) \u884c\u7684 -- \u5148\u8bfb\u53d6\u518d\u8d4b\u503c\u3002\u56e0\u6b64\u90fd\u89e6\u53d1\u4e86\u3002<\/p>\n<\/blockquote>\n
\u76d1\u542c\u5bf9\u8c61\u6570\u636e\u8bfb\u53d6\u548c\u4fee\u6539<\/h1>\n\u4f18\u5316<\/h2>\n\/\/ reactive.js\nimport { isObject } from '.\/utils.js';\nimport { handlers } from '.\/handlers.js';\n\nconst target_map = new WeakMap();\n\n\/\/ \u5c06\u4e00\u4e2a\u6570\u636e\u53d8\u4e3a\u54cd\u5e94\u5f0f\u6570\u636e\nexport function reactive(target) {\n \/\/ \u4e0d\u662f\u5bf9\u8c61\uff0c\u76f4\u63a5\u8fd4\u56de\n if (!isObject(target)) {\n return target;\n }\n \/\/ \u540c\u4e00\u4e2a\u5bf9\u8c61, \u76f4\u63a5\u8fd4\u56de\n if (target_map.has(target)) {\n return target_map.get(target);\n }\n \/\/ \u521b\u5efa\u4ee3\u7406\u5bf9\u8c61\n const proxy = new Proxy(target, handlers);\n \/\/ \u7f13\u5b58\n target_map.set(target, proxy);\n return proxy;\n}\n<\/code><\/pre>\n\/\/ handlers.js\nimport { track, trigger } from '.\/effect.js';\n\nexport const handlers = {\n get(target, key) {\n \/\/ \u4f9d\u8d56\u6536\u96c6\uff1a\u627e\u5230\u5f53\u524dkey\u5bf9\u5e94\u7684\u4f9d\u8d56\n track(target, key);\n \/\/ \u8fd4\u56de\u503c\n return Reflect.get(target, key);\n },\n set(target, key, value) {\n \/\/ \u6d3e\u53d1\u66f4\u65b0\n trigger(target, key);\n \/\/ \u8bbe\u7f6e\u503c\n return Reflect.set(target, key, value);\n }\n}\n<\/code><\/pre>\n\u8bfb\u53d6<\/h2>\n
\u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\u82e5\u5bf9\u8c61\u4f7f\u7528\u4e86 getter \u6216 setter \u4f1a\u53d1\u751f\u4ee5\u4e0b\u60c5\u51b5\uff1a<\/p>\n
\/\/ index.js\nimport { reactive } from ".\/reactive.js";\n\nconst state = reactive({\n harvester: 2,\n builder: 5,\n upgrader: 5,\n get total() {\n return this.harvester + this.builder + this.upgrader;\n }\n});\n\nfunction fn() {\n state.total;\n}\n\nfn();\n\/\/ \u8f93\u51fa\uff1a\u4f9d\u8d56\u6536\u96c6\uff1atotal\n<\/code><\/pre>\n\u6211\u4eec\u5e0c\u671b\u7684\u662f\u5e94\u8be5\u4e5f\u76d1\u542c\u5230 total \u4e2d\u4f7f\u7528\u7684\u5c5e\u6027
\n\u5728\u5185\u90e8\u8bbf\u95ee\u65b9\u6cd5\u4e2d\uff0c\u8fd8\u6709\u4e00\u4e2a receiver \u53ef\u4ee5\u6307\u5b9a this \u6307\u5411\uff1a<\/p>\n
\/\/ handler.js\nimport { track, trigger } from '.\/effect.js';\n\nexport const handlers = {\n get(target, key, receiver) {\n \/\/ \u4f9d\u8d56\u6536\u96c6\uff1a\u627e\u5230\u5f53\u524dkey\u5bf9\u5e94\u7684\u4f9d\u8d56\n track(target, key);\n \/\/ \u8fd4\u56de\u503c\n return Reflect.get(target, key, receiver);\n },\n set(target, key, value, receiver) {\n \/\/ \u6d3e\u53d1\u66f4\u65b0\n trigger(target, key);\n \/\/ \u8bbe\u7f6e\u503c\n return Reflect.set(target, key, value, receiver);\n }\n}\n<\/code><\/pre>\n\u4e8e\u662f\uff1a
\n
<\/div>
\n\u53ef\u4ee5\u76d1\u542c\u5230\u6240\u6709\u5c5e\u6027\u4e86<\/p>\n\u4f46\u662f\uff01<\/strong>
\n\u8003\u8651\u4ee5\u4e0b\u60c5\u51b5\uff1a<\/p>\nimport { reactive } from ".\/reactive.js";\n\nconst state = reactive({\n harvester: 2,\n builder: 5,\n upgrader: 5,\n spawn_point: {\n x: 0,\n y: 0\n }\n\n});\n\nfunction fn() {\n state.spawn_point.x;\n state.spawn_point.y;\n}\n\nfn();\n\/\/ \u8f93\u51fa\uff1a\n\/\/ \u4f9d\u8d56\u6536\u96c6\uff1aspawn_point\n\/\/ \u4f9d\u8d56\u6536\u96c6\uff1aspawn_point\n<\/code><\/pre>\n\u4e3a\u4ec0\u4e48\u6ca1\u6709 x \u548c y \u5462\uff1f
\n\u5728 handler \u4e2d\uff0c\u82e5 Reflect.get \u83b7\u53d6\u5230\u7684\u662f\u4e00\u4e2a\u5bf9\u8c61\uff0c\u88ab\u76f4\u63a5\u8fd4\u56de\uff0c\u5e76\u6ca1\u6709\u88ab\u4ee3\u7406\uff0c\u4e5f\u5c31\u65e0\u6cd5\u76d1\u542c\u3002<\/p>\n
\/\/ handler.js\nimport { track, trigger } from '.\/effect.js';\nimport { isObject } from '.\/utils.js';\nimport { reactive } from '.\/reactive.js';\n\nexport const handlers = {\n get(target, key, receiver) {\n \/\/ \u4f9d\u8d56\u6536\u96c6\uff1a\u627e\u5230\u5f53\u524dkey\u5bf9\u5e94\u7684\u4f9d\u8d56\n track(target, key);\n \/\/ \u8fd4\u56de\u503c\n const result = Reflect.get(target, key, receiver);\n \/\/ \u5982\u679c\u662f\u5bf9\u8c61\uff0c\u9012\u5f52\u4ee3\u7406\n return isObject(result) ? reactive(result) : result;\n },\n set(target, key, value, receiver) {\n \/\/ \u6d3e\u53d1\u66f4\u65b0\n trigger(target, key);\n \/\/ \u8bbe\u7f6e\u503c\n return Reflect.set(target, key, value, receiver);\n }\n}\n<\/code><\/pre>\n\u5224\u65ad\u8fd4\u56de\u503c\u662f\u5426\u662f\u5bf9\u8c61\uff0c\u82e5\u662f\u5219\u4ee3\u7406\u540e\u8fd4\u56de\u3002
\n![\"Pasted](\"https:\/\/levin.ink\/wp-content\/uploads\/2024\/07\/Pasted-image-20240706183355.png\")
<\/p>\n
\u4f46\u662f\uff08\u6885\u5f00\u4e8c\u5ea6\uff09
\n\u8003\u8651\u4ee5\u4e0b\u60c5\u51b5\uff1a<\/p>\n
import { reactive } from ".\/reactive.js";\n\nconst state = reactive({\n harvester: 2,\n builder: 5,\n upgrader: 5\n});\n\nfunction fn() {\n "carrier" in state;\n}\n\nfn();\n<\/code><\/pre>\n\u6b64\u65f6\u4e0d\u4f1a\u89e6\u53d1\u6536\u96c6\uff0c\u56e0\u6b64\u52a0\u5165 has \u65b9\u6cd5<\/p>\n
\/\/ handler.js\nimport { track, trigger } from '.\/effect.js';\nimport { isObject } from '.\/utils.js';\nimport { reactive } from '.\/reactive.js';\n\nexport const handlers = {\n get(target, key, receiver) {\n \/\/ \u4f9d\u8d56\u6536\u96c6\uff1a\u627e\u5230\u5f53\u524dkey\u5bf9\u5e94\u7684\u4f9d\u8d56\n track(target, key);\n \/\/ \u8fd4\u56de\u503c\n const result = Reflect.get(target, key, receiver);\n \/\/ \u5982\u679c\u662f\u5bf9\u8c61\uff0c\u9012\u5f52\u4ee3\u7406\n return isObject(result) ? reactive(result) : result;\n },\n has(target, key) {\n \/\/ \u4f9d\u8d56\u6536\u96c6\uff1a\u627e\u5230\u5f53\u524dkey\u5bf9\u5e94\u7684\u4f9d\u8d56\n track(target, key);\n \/\/ \u8fd4\u56de\u503c\n return Reflect.has(target, key);\n },\n set(target, key, value, receiver) {\n \/\/ \u6d3e\u53d1\u66f4\u65b0\n trigger(target, key);\n \/\/ \u8bbe\u7f6e\u503c\n return Reflect.set(target, key, value, receiver);\n }\n\n}\n<\/code><\/pre>\n\u8fd8\u6709\u5417\uff0c\u6709\uff0c\u904d\u5386\uff0c\u52a0\u5165\u5373\u53ef\u3002<\/p>\n
\u52a0\u5165 type<\/h2>\n
\u5728\u524d\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u82e5\u4f7f\u7528 in \u68c0\u67e5\u4e86\u952e<\/p>\n
function fn() {\n "carrier" in state;\n}\n<\/code><\/pre>\n\u5f53\u5bf9\u5e94\u952e\u5df2\u7ecf\u5b58\u5728\u65f6\uff0c\u540e\u7eed\u7684\u6539\u53d8\uff0c\u6211\u4eec\u4e0d\u5e0c\u671b\u6b64\u65f6\u8ba4\u4e3a\u9700\u8981\u89e6\u53d1\u66f4\u65b0\uff0c\u4e8e\u662f\u52a0\u5165\u64cd\u4f5c type\uff0c\u65b9\u4fbf\u540e\u7eed\u64cd\u4f5c\u3002<\/p>\n
\/\/ effect.js\n\/\/ Description: \u4f9d\u8d56\u6536\u96c6\nexport function track(target, type, key) {\n \/\/ \u4f9d\u8d56\u6536\u96c6\n console.log(`%c\u4f9d\u8d56\u6536\u96c6\uff1a[${type}] ${key}`, 'color: red');\n}\n\n\/\/ Description: \u6d3e\u53d1\u66f4\u65b0\nexport function trigger(target, type, key) {\n \/\/ \u6d3e\u53d1\u66f4\u65b0\n console.log(`%c\u6d3e\u53d1\u66f4\u65b0\uff1a[${type}] ${key}`, 'color: blue');\n}\n<\/code><\/pre>\n\/\/ handler.js\nimport { track, trigger } from '.\/effect.js';\nimport { isObject } from '.\/utils.js';\nimport { reactive } from '.\/reactive.js';\nimport { TrackOpTypes, TriggerOpTypes } from '.\/operations.js';\n\nexport const handlers = {\n get(target, key, receiver) {\n \/\/ \u4f9d\u8d56\u6536\u96c6\uff1a\u627e\u5230\u5f53\u524dkey\u5bf9\u5e94\u7684\u4f9d\u8d56\n track(target, TrackOpTypes.GET, key);\n \/\/ \u8fd4\u56de\u503c\n const result = Reflect.get(target, key, receiver);\n \/\/ \u5982\u679c\u662f\u5bf9\u8c61\uff0c\u9012\u5f52\u4ee3\u7406\n return isObject(result) ? reactive(result) : result;\n },\n has(target, key) {\n \/\/ \u4f9d\u8d56\u6536\u96c6\uff1a\u627e\u5230\u5f53\u524dkey\u5bf9\u5e94\u7684\u4f9d\u8d56\n track(target, TrackOpTypes.HAS, key);\n \/\/ \u8fd4\u56de\u503c\n return Reflect.has(target, key);\n },\n set(target, key, value, receiver) {\n \/\/ \u6d3e\u53d1\u66f4\u65b0\n \/\/ TODO: \u5224\u65ad\u64cd\u4f5c\u7c7b\u578b\n trigger(target, TriggerOpTypes.SET, key);\n \/\/ \u8bbe\u7f6e\u503c\n return Reflect.set(target, key, value, receiver);\n }\n\n}\n<\/code><\/pre>\n\u53ef\u4ee5\u770b\u5230\u83b7\u53d6\u5230\u4e86\u66f4\u8be6\u7ec6\u7684\u4fe1\u606f\uff0c\u65b9\u4fbf\u540e\u7eed\u64cd\u4f5c\u3002
\n![\"Pasted](\"https:\/\/levin.ink\/wp-content\/uploads\/2024\/07\/Pasted-image-20240706205535.png\")
<\/p>\n
\u4f18\u5316...<\/p>\n
\/\/ hanlder.js\nimport { track, trigger } from '.\/effect.js';\nimport { isObject } from '.\/utils.js';\nimport { reactive } from '.\/reactive.js';\nimport { TrackOpTypes, TriggerOpTypes } from '.\/operations.js';\n\nfunction get(target, key, receiver) {\n \/\/ \u4f9d\u8d56\u6536\u96c6\uff1a\u627e\u5230\u5f53\u524dkey\u5bf9\u5e94\u7684\u4f9d\u8d56\n track(target, TrackOpTypes.GET, key);\n \/\/ \u8fd4\u56de\u503c\n const result = Reflect.get(target, key, receiver);\n \/\/ \u5982\u679c\u662f\u5bf9\u8c61\uff0c\u9012\u5f52\u4ee3\u7406\n return isObject(result) ? reactive(result) : result;\n}\n\nfunction has(target, key) {\n \/\/ \u4f9d\u8d56\u6536\u96c6\uff1a\u627e\u5230\u5f53\u524dkey\u5bf9\u5e94\u7684\u4f9d\u8d56\n track(target, TrackOpTypes.HAS, key);\n \/\/ \u8fd4\u56de\u503c\n return Reflect.has(target, key);\n}\n\nfunction set(target, key, value, receiver) {\n \/\/ \u6d3e\u53d1\u66f4\u65b0\n \/\/ TODO: \u5224\u65ad\u64cd\u4f5c\u7c7b\u578b\n trigger(target, TriggerOpTypes.SET, key);\n \/\/ \u8bbe\u7f6e\u503c\n return Reflect.set(target, key, value, receiver);\n}\n\nfunction ownKeys(target) {\n \/\/ \u6d3e\u53d1\u66f4\u65b0\n track(target, TrackOpTypes.ITERATE);\n \/\/ \u8fd4\u56de\u503c\n return Reflect.ownKeys(target);\n}\n\nexport const handlers = {\n get,\n has,\n set,\n ownKeys,\n}\n<\/code><\/pre>\n\u4fee\u6539<\/h2>\n
\u533a\u5206 add \u4e0e set<\/p>\n
function set(target, key, value, receiver) {\n const type = target.hasOwnProperty(key) ? TriggerOpTypes.SET : TriggerOpTypes.ADD;\n \/\/ \u6d3e\u53d1\u66f4\u65b0\n trigger(target, type, key);\n \/\/ \u8bbe\u7f6e\u503c\n return Reflect.set(target, key, value, receiver);\n}\n<\/code><\/pre>\n\u52a0\u5165 delete\uff0c\u52a0\u5165\u4e00\u4e9b\u5224\u65ad<\/p>\n
\/\/ handler.js\nimport { track, trigger } from '.\/effect.js';\nimport { isObject, isObject } from '.\/utils.js';\nimport { reactive } from '.\/reactive.js';\nimport { TrackOpTypes, TriggerOpTypes } from '.\/operations.js';\n\nfunction get(target, key, receiver) {\n \/\/ \u4f9d\u8d56\u6536\u96c6\uff1a\u627e\u5230\u5f53\u524dkey\u5bf9\u5e94\u7684\u4f9d\u8d56\n track(target, TrackOpTypes.GET, key);\n \/\/ \u8fd4\u56de\u503c\n const result = Reflect.get(target, key, receiver);\n \/\/ \u5982\u679c\u662f\u5bf9\u8c61\uff0c\u9012\u5f52\u4ee3\u7406\n return isObject(result) ? reactive(result) : result;\n}\n\nfunction has(target, key) {\n \/\/ \u4f9d\u8d56\u6536\u96c6\uff1a\u627e\u5230\u5f53\u524dkey\u5bf9\u5e94\u7684\u4f9d\u8d56\n track(target, TrackOpTypes.HAS, key);\n \/\/ \u8fd4\u56de\u503c\n return Reflect.has(target, key);\n}\n\nfunction set(target, key, value, receiver) {\n const type = target.hasOwnProperty(key) ? TriggerOpTypes.SET : TriggerOpTypes.ADD;\n \n const oldValue = target[key];\n const result = Reflect.set(target, key, value, receiver);\n\n if (result && (hasChanged(value, oldValue) || type === TriggerOpTypes.ADD)) {\n \/\/ \u6d3e\u53d1\u66f4\u65b0\n trigger(target, type, key);\n }\n \/\/ \u8bbe\u7f6e\u503c\n return result;\n}\n\nfunction deleteProperty(target, key) {\n const hadKey = target.hasOwnProperty(key);\n \/\/ \u5220\u9664\u503c\n const result = Reflect.deleteProperty(target, key);\n if (hadKey && result) {\n \/\/ \u6d3e\u53d1\u66f4\u65b0\n trigger(target, TriggerOpTypes.DELETE, key);\n }\n return result;\n}\n\nfunction ownKeys(target) {\n \/\/ \u4f9d\u8d56\u6536\u96c6\n track(target, TrackOpTypes.ITERATE);\n \/\/ \u8fd4\u56de\u503c\n return Reflect.ownKeys(target);\n}\n\nexport const handlers = {\n get,\n has,\n set,\n ownKeys,\n deleteProperty\n}\n<\/code><\/pre>\n\u6d4b\u8bd5\u4ee3\u7801\uff1a<\/p>\n
\/\/ index.js\nimport { reactive } from ".\/reactive.js";\n\nconst state = reactive({\n harvester: 2,\n builder: 5,\n upgrader: 5\n});\n\nfunction fn() {\n Object.keys(state);\n\n}\n\nfn();\n\nstate.builder = +0; \/\/ (*)\nstate.carrier = 3; \/\/ (**)\n\nstate.builder = -0; \/\/ (***)\nstate.builder = -0; \/\/ (****)\n\ndelete state.carrier;\ndelete state.carrier;\n<\/code><\/pre>\n\u7ed3\u679c\uff1a
\n
<\/div>
\n\u8ba9\u6211\u4eec\u6765\u5206\u6790\u4e00\u4e0b\uff1a<\/p>\n\n- fn \u51fd\u6570\u4e2d\u4f7f\u7528Object.keys\u8fd4\u56de\u5bf9\u8c61\u7684\u6240\u6709\u952e\uff0c\u89e6\u53d1\u4e86ownKeys\uff0c\u8fdb\u884c\u4f9d\u8d56\u6536\u96c6\u3002<\/li>\n
- (*) \u884c\u66f4\u6539 builder \u503c\uff0c5 => +0 \u503c\u53d8\u5316\uff0c\u89e6\u53d1set\u3002<\/li>\n
- (**) \u884c\u6dfb\u52a0 carrier \u5c5e\u6027\uff0c\u89e6\u53d1add\u3002<\/li>\n
- (***) \u884c\u66f4\u6539 builder \u503c\uff0c+0 => -0 \u503c\u53d8\u5316\uff0c\u89e6\u53d1set\u3002<\/li>\n
- (****) \u884c\u503c\u672a\u53d8\u5316\uff0c\u672a\u89e6\u53d1set\u3002<\/li>\n
- \u6700\u540e\u4e24\u884c\uff0c\u7b2c\u4e00\u884c\u5220\u9664 carrier \u5c5e\u6027\uff0c\u89e6\u53d1delete\uff0c\u7b2c\u4e8c\u884c\u5df2\u7ecf\u6ca1\u6709 carrier \u5c5e\u6027\uff0c\u4e0d\u518d\u89e6\u53d1delete\u3002<\/li>\n<\/ul>\n
\n\u4e25\u683c\u7b49\u4e8e\u8fd8\u662f Object.is?
\n+0 === -0 \u7ed3\u679c\u4e3a true\uff0cNaN === NaN \u7ed3\u679c\u4e3a false\u3002
\nObject.is(-0, +0) \u7ed3\u679c\u4e3a false\uff0cObject.is(NaN, NaN) \u7ed3\u679c\u4e3a true\u3002
\n\u6211\u4eec\u9700\u8981\u7684\u662f\u5224\u65ad\u65b0\u503c\u662f\u5426\u4f1a\u6539\u53d8\u51fd\u6570\u7684\u8fd0\u884c\u7ed3\u679c\uff0c\u56e0\u6b64\u6211\u4eec\u4f7f\u7528Object.is\u3002<\/p>\n<\/blockquote>\n
\u76d1\u542c\u6570\u7ec4\u6570\u636e\u8bfb\u53d6\u548c\u4fee\u6539<\/h1>\n\u8bfb\u53d6<\/h2>\n\u5c1d\u901d<\/h3>\n
\u73b0\u5728\u8ba9\u6211\u4eec\u8003\u8651\u4e00\u4e0b\u54cd\u5e94\u5f0f\u6570\u636e\u662f\u6570\u7ec4\u7684\u60c5\u51b5\u3002<\/p>\n
import { reactive } from ".\/reactive.js";\n\nconst state = reactive([1, 2, 3, 4, 5]);\n\nfunction fn() {\n\tconsole.log('0---------');\n state[0];\n state.length;\n\n console.log('1---------');\n for (let i = 0; i < state.length; i++) {\n state[i];\n }\n\n console.log('2---------');\n state.includes(3);\n\n console.log('3---------');\n state.indexOf(2);\n\n console.log('4---------');\n for (let key of state) {\n state[key];\n }\n}\n\nfn();\n<\/code><\/pre>\n\u8ba9\u6211\u4eec\u4f9d\u6b21\u6765\u770b\u4e00\u4e0b\u7ed3\u679c\uff1a
\n\u7b2c\u96f6\u90e8\u5206\uff0c\u6b63\u5e38\u83b7\u53d6\uff0c\u6b63\u786e\u6536\u96c6
\n
<\/div>
\n\u7b2c\u4e00\u90e8\u5206\uff0c\u4f7f\u7528for\u5faa\u73af\u904d\u5386\uff0c\u6bcf\u6b21\u83b7\u53d6length\u4ee5\u53ca\u4e0b\u6807\uff0c\u6709\u91cd\u590d\uff0c\u4f46\u6682\u65f6\u4e0d\u7528\u5904\u7406\u3002
\n<\/div>
\n\u7b2c\u4e8c\u90e8\u5206\uff0c\u5148\u83b7\u53d6\u5230includes\u5c5e\u6027\uff0c\u7136\u540e\u8fd0\u884c\u51fd\u6570\uff0c\u4ece0\u5f00\u59cb\u53d6\u51fa\u6570\u636e\u4e0e3\u6bd4\u8f83\uff0c\u627e\u5230\u4e0b\u6807\u4e3a2\u65f6\u76f8\u7b49\uff0c\u8fd4\u56de\u7ed3\u679c\u3002\u6536\u96c6\u6b63\u786e\u3002
\n<\/div>
\n\u7b2c\u4e09\u90e8\u5206\uff0c\u8bbf\u95eeindexOf\uff0c\u7136\u540elength\uff0c\u53d1\u73b0\u4f7f\u7528\u4e86has\uff0cindexOf\u4f1a\u5148\u68c0\u67e5\u662f\u5426\u6709\u8fd9\u4e2a\u952e\uff0c\u7136\u540e\u518d\u53d6\u51fa\u8bbf\u95ee\u3002
\n<\/div>
\n\u7b2c\u56db\u90e8\u5206\uff0c\u554a\u561e\uff0c\u6ca1\u8f93\u51fa\uff1f
\n<\/div>
\n\u67e5\u770b\u62a5\u9519\u4fe1\u606f\uff0c\u53d1\u73b0\u5c06Symbol\u952e\u8f6c\u6362\u4e3astring\u5931\u8d25\uff0c\u66f4\u6539effect.js\uff1a<\/p>\n\/\/ effect.js\nimport { TrackOpTypes, TriggerOpTypes } from ".\/operations.js";\n\n\/\/ Description: \u4f9d\u8d56\u6536\u96c6\nexport function track(target, type, key) {\n \/\/ \u4f9d\u8d56\u6536\u96c6\n if (type === TrackOpTypes.ITERATE) {\n console.log(`%c\u4f9d\u8d56\u6536\u96c6\uff1a[${type}]`, 'color: red');\n }\n else {\n console.log(`%c\u4f9d\u8d56\u6536\u96c6\uff1a[${type}] `, 'color: red', key);\n }\n}\n\n\/\/ Description: \u6d3e\u53d1\u66f4\u65b0\nexport function trigger(target, type, key) {\n \/\/ \u6d3e\u53d1\u66f4\u65b0\n console.log(`%c\u6d3e\u53d1\u66f4\u65b0\uff1a[${type}] `, 'color: blue', key);\n}\n<\/code><\/pre>\n\u7ed3\u679c\uff1a
\n![\"Pasted](\"https:\/\/levin.ink\/wp-content\/uploads\/2024\/07\/Pasted-image-20240707152024.png\")
<\/p>\n
\n\u4e3a\u4ec0\u4e48\u8981\u5224\u65ad\u6570\u7ec4\u6709\u6ca1\u6709\u4e0b\u6807
\n\u5b58\u5728\u7a00\u758f\u6570\u7ec4\uff1a[0, , , 2]<\/code>\uff0c\u6839\u636e\u6211\u4eec\u4e0a\u9762\u53d1\u73b0\u7684\u903b\u8f91\uff0c\u82e5\u6211\u4eec\u8bd5\u56fe\u5728\u6570\u7ec4\u4e2d\u627eundefined<\/code>\uff0c\u4f1a\u8fd4\u56de\u4e0b\u68071\u5417\uff1f
\n\u4e0d\u4f1a\uff0c\u56e0\u4e3a\u4f1a\u5148\u5224\u65ad\u952e\u662f\u5426\u5b58\u5728\uff0c\u4e0d\u5b58\u5728\u5c06\u76f4\u63a5\u8df3\u8fc7\uff0c\u4e0d\u4f1a\u6709\u540e\u7eed\u6bd4\u8f83\u3002<\/p>\n<\/blockquote>\n\u770b\u8d77\u6765\u4e0d\u9519\uff0c\u662f\u5417\uff1f<\/p>\n
\u6570\u7ec4\u4e2d\u7684\u5bf9\u8c61<\/h3>\n
\u770b\u770b\u8fd9\u4e2a\uff1a<\/p>\n
import { reactive } from ".\/reactive.js";\n\nconst obj = {};\nconst state = reactive([1, obj, 3]);\n\nfunction fn() {\n console.log(state.indexOf(obj));\n}\n\nfn();\n<\/code><\/pre>\n\u80fd\u627e\u5230\u5417\uff1f
\n
<\/div>
\n\u6ca1\u627e\u5230\uff0c\u4e3a\u4ec0\u4e48\uff1f
\n\u8fd8\u8bb0\u5f97\u6211\u4eec\u4e0a\u4e00\u7ae0\u4e2d\u7684\uff0c\u5bf9\u8c61\u4e2d\u7684\u5bf9\u8c61\u5982\u4f55\u5904\u7406\u7684\u5417\uff1f
\n\u6211\u4eec\u68c0\u6d4b\u8fd4\u56de\u7684\u662f\u5426\u662f\u5bf9\u8c61\uff0c\u82e5\u662f\u5c06\u5176\u4ee3\u7406\uff0c\u90a3\u4e48\u8fd9\u91cc\u6570\u7ec4\u91cc\u7684\u5bf9\u8c61\u5728\u8bbf\u95ee\u65f6\u8fd4\u56de\u7684\u662f\u88ab\u4ee3\u7406\u540e\u7684\u5bf9\u8c61\uff0c\u4e0e\u539f\u5bf9\u8c61\u4e0d\u540c\uff0c\u90a3\u5c31\u627e\u4e0d\u5230\u4e86\u3002
\n\u4e24\u4e2a\u89e3\u51b3\u65b9\u6848\uff1a<\/p>\n\n- \u4f20\u5165\u7684\u539f\u59cb\u5bf9\u8c61\u8f6c\u6362\u4e3a\u4ee3\u7406\u5bf9\u8c61\u3002<\/li>\n
- \u4ee3\u7406\u5bf9\u8c61\u4e2d\u627e\u4e0d\u5230\uff0c\u5728\u539f\u59cb\u6570\u7ec4\u4e2d\u53bb\u91cd\u65b0\u627e\u3002\uff08VUE\u91c7\u7528\u7684\u65b9\u6848\uff09
\n\u65b9\u6cd5\u4e00\u770b\u8d77\u6765\u66f4\u597d\uff0c\u56e0\u6b64\u6211\u4eec\u9009\u62e9\u7b2c\u4e8c\u79cd\u3002\uff08\u6b38\u563f\uff09<\/li>\n<\/ol>\n\u6211\u4eec\u9700\u8981\u6539\u52a8get\u65b9\u6cd5\uff0c\u62e6\u622a\u83b7\u53d6\u7684indexOf\u65b9\u6cd5\uff0c\u8fd4\u56de\u6211\u4eec\u66f4\u6539\u540e\u7684\u65b9\u6cd5\u3002<\/p>\n
\/\/ handlers.js\n...\nconst arrayInstrumentations = {};\nconst RAW = Symbol('raw');\n\n["includes", "indexOf", "lastIndexOf"].forEach(key => {\n arrayInstrumentations[key] = function(...args) {\n \/\/ \u6b63\u5e38\u627e\u4ece\u4ee3\u7406\u5bf9\u8c61\u4e2d\u627e\n const res = Array.prototype[key].apply(this, args);\n \/\/ \u82e5\u627e\u4e0d\u5230\uff0c\u518d\u5728\u539f\u59cb\u6570\u7ec4\u4e2d\u627e\n if (res === -1 || res === false) {\n return Array.prototype[key].apply(this[RAW], args);\n }\n return res;\n };\n});\n\nfunction get(target, key, receiver) {\n \/\/ \u8fd4\u56de\u539f\u59cb\u5bf9\u8c61 (***)\n if (key === RAW) {\n return target;\n }\n \/\/ \u4f9d\u8d56\u6536\u96c6\uff1a\u627e\u5230\u5f53\u524dkey\u5bf9\u5e94\u7684\u4f9d\u8d56\n track(target, TrackOpTypes.GET, key);\n \/\/ \u8fd4\u56de\u503c\n if (arrayInstrumentations.hasOwnProperty(key) && Array.isArray(target)) {\n return arrayInstrumentations[key];\n }\n\n const result = Reflect.get(target, key, receiver);\n \/\/ \u5982\u679c\u662f\u5bf9\u8c61\uff0c\u9012\u5f52\u4ee3\u7406\n return isObject(result) ? reactive(result) : result;\n}\n...\n<\/code><\/pre>\n\u5f53get\u8fd9["includes", "indexOf", "lastIndexOf"]\u4e09\u4e2a\u65b9\u6cd5\u65f6\uff0c\u6211\u4eec\u8fd4\u56de\u6211\u4eec\u81ea\u5b9a\u4e49\u7684\u65b9\u6cd5\uff0c\u5148\u6b63\u5e38\u627e\uff0c\u82e5\u627e\u4e0d\u5230\u5219\u83b7\u53d6\u539f\u59cb\u5bf9\u8c61\u518d\u627e\u3002<\/p>\n
\n(***)\u884c\uff0c\u4e3a\u4e86\u907f\u514d\u4e0e\u4f20\u5165\u7684\u5bf9\u8c61\u952e\u51b2\u7a81\uff0c\u4f7f\u7528Symbol\u907f\u514d\u51b2\u7a81\u3002<\/p>\n<\/blockquote>\n
\n\u65b9\u6cd5\u4e8c\u5e26\u6765\u7684\u95ee\u9898
\n\u5728\u6211\u4eec\u5f00\u5934\u7684\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u67e5\u627eobj\uff0c\u6309\u7167\u6b63\u5e38\u67e5\u627e\u7684\u903b\u8f91\uff0c\u6211\u4eec\u5728\u4e0b\u68071\u5c31\u5e94\u8be5\u627e\u5230\u4e86\uff0c\u6211\u4eec\u4e0d\u5e94\u8be5\u6536\u96c6\u5230\u4e0b\u68072\uff0c\u4f46\u662f\u5982\u4e0b\u56fe\uff0c\u6211\u4eec\u5374\u6536\u96c6\u5230\u4e86\u4e0b\u68072\u3002
\n![\"Pasted](\"https:\/\/levin.ink\/wp-content\/uploads\/2024\/07\/Pasted-image-20240707161136.png\")
<\/p>\n<\/blockquote>\n
\u4fee\u6539<\/h2>\nLength\u89e6\u53d1\u95ee\u9898<\/h3>\n
\u770b\u770b\u8fd9\u4e2a<\/p>\n
const obj = {};\nconst state = reactive([1, obj, 3, , 5]);\n\n\/\/ \u7b49\u540c\u4e8e state[state.length] = 6;\n\/\/ \u5373\u4fee\u6539\u4e00\u4e2a\u8d85\u8fc7\u6570\u7ec4\u957f\u5ea6\u7d22\u5f15\nstate.push(6);\n<\/code><\/pre>\n<\/div>
\nlength\u5462\uff1fpush\u540elength\u4e5f\u4f1a\u53d8\u5316\uff0c\u4f46\u8fd9\u91cc\u5e76\u672a\u51fa\u73b0length\u7684\u53d8\u5316
\nlength\u7684\u5c5e\u6027\u8bbe\u7f6e\u662f\u901a\u8fc7defineProperty\u65b9\u6cd5\uff0c\u6211\u4eec\u4f7f\u7528\u4e0b\u9762\u7684\u65b9\u6cd5\u8bd5\u8bd5\u3002<\/p>\nObject.defineProperty(state, 'length', 7);\n<\/code><\/pre>\n\u5e76\u672a\u8f93\u51falength\u7684\u4fee\u6539\uff0c\u56e0\u6b64\u8ba9\u6211\u4eec\u6dfb\u52a0\u76d1\u542c\u3002<\/p>\n
\u9996\u5148\u5206\u6790\u4e00\u4e0b\u4ec0\u4e48\u60c5\u51b5\u4e0b\u9700\u8981\u624b\u52a8\u89e6\u53d1length\u5c5e\u6027\u53d8\u5316<\/p>\n
\n- \u8bbe\u7f6e\u7684\u5bf9\u8c61\u662f\u4e00\u4e2a\u6570\u7ec4\u3002<\/li>\n
- \u8bbe\u7f6e\u524d\u540elength\u53d1\u751f\u4e86\u53d8\u5316\u3002<\/li>\n
- \u8bbe\u7f6e\u7684\u4e0d\u662flength\u5c5e\u6027\u3002
\n\u4e0a\u9762\u4e09\u4e2a\u6761\u4ef6\u540c\u65f6\u6ee1\u8db3\u5c31\u9700\u8981\u624b\u52a8\u89e6\u53d1\u3002<\/li>\n<\/ol>\nfunction set(target, key, value, receiver) {\n const type = target.hasOwnProperty(key) ? TriggerOpTypes.SET : TriggerOpTypes.ADD;\n \n const oldValue = target[key];\n const oldLength = Array.isArray(target) ? target.length : undefined;\n \/\/ \u8bbe\u7f6e\u503c\n const result = Reflect.set(target, key, value, receiver);\n\n const newLength = Array.isArray(target) ? target.length : undefined;\n\n if (result && (hasChanged(value, oldValue) || type === TriggerOpTypes.ADD)) {\n \/\/ \u6d3e\u53d1\u66f4\u65b0\n trigger(target, type, key);\n \/\/ \u6570\u7ec4\u957f\u5ea6\u53d8\u5316\n if (Array.isArray(target) && key !== 'length' && newLength !== oldLength) {\n trigger(target, TriggerOpTypes.SET, 'length');\n }\n\n }\n return result;\n}\n<\/code><\/pre>\n\u7ed3\u679c\uff1a
\n![\"Pasted](\"https:\/\/levin.ink\/wp-content\/uploads\/2024\/07\/Pasted-image-20240707171013.png\")
<\/p>\n
\u8fd8\u6ca1\u5b8c\uff0c\u5f53\u6211\u4eec\u5c06length\u76f4\u63a5\u6539\u5c0f\u65f6\uff1a<\/p>\n
state.length = state.length - 2;\n<\/code><\/pre>\n<\/div>
\nlength\u6539\u5c0f\u4f1a\u5220\u9664\u5c5e\u6027\uff0c\u4f46\u5e76\u672a\u76d1\u542c\u5230\uff0c\u56e0\u6b64\u7ee7\u7eed\u5224\u65ad\uff1a<\/p>\nfunction set(target, key, value, receiver) {\n const type = target.hasOwnProperty(key) ? TriggerOpTypes.SET : TriggerOpTypes.ADD;\n \n const oldValue = target[key];\n const oldLength = Array.isArray(target) ? target.length : undefined;\n \/\/ \u8bbe\u7f6e\u503c\n const result = Reflect.set(target, key, value, receiver);\n\n const newLength = Array.isArray(target) ? target.length : undefined;\n\n if (result && (hasChanged(value, oldValue) || type === TriggerOpTypes.ADD)) {\n \/\/ \u6d3e\u53d1\u66f4\u65b0\n trigger(target, type, key);\n \/\/ \u6570\u7ec4\u957f\u5ea6\u53d8\u5316\n if (Array.isArray(target) && newLength !== oldLength) {\n if (key !== 'length') {\n trigger(target, TriggerOpTypes.SET, 'length');\n }\n else {\n \/\/ \u627e\u5230\u88ab\u5220\u9664\u7684\u5143\u7d20\uff0c\u89e6\u53d1\u66f4\u65b0\n for (let i = newLength; i < oldLength; i++) {\n trigger(target, TriggerOpTypes.DELETE, i + '');\n }\n }\n }\n\n }\n return result;\n}\n<\/code><\/pre>\n\u9700\u8981\u6536\u96c6Length\u5417<\/h3>\n
\u8fd8\u8bb0\u5f97\u521a\u521a\u7684\u4f8b\u5b50\u5417<\/p>\n
const obj = {};\nconst state = reactive([1, obj, 3, , 5]);\n\n\/\/ \u7b49\u540c\u4e8e state[state.length] = 6;\n\/\/ \u5373\u4fee\u6539\u4e00\u4e2a\u8d85\u8fc7\u6570\u7ec4\u957f\u5ea6\u7d22\u5f15\nstate.push(6);\n<\/code><\/pre>\n<\/div>
\n\u8ba9\u6211\u4eec\u770b\u770b\u6536\u96c6\u90e8\u5206\uff0c\u6536\u96c6\u5230push\uff0c\u6ca1\u95ee\u9898\uff0c\u5982\u679cpush\u88ab\u6539\u4e86\u7ed3\u679c\u4f1a\u53d8\uff0c\u6536\u96c6\u5230length\uff0c\u4f3c\u4e4e\u6ca1\u95ee\u9898\u3002
\n\u4f46\u662f\u8003\u8651\u4e00\u4e0b\u4f7f\u7528push\u7684\u76ee\u7684\uff0c\u662f\u60f3\u6dfb\u52a0\u4e00\u4e2a\u5143\u7d20\u8fdb\u53bb\uff0c\u5e76\u4e0d\u60f3\u6536\u96c6length\uff0c
\n\u6211\u4eec\u5982\u679c\u9700\u8981\u6536\u96c6length\uff0c\u4e3a\u4ec0\u4e48\u4e0d\u76f4\u63a5\u83b7\u53d6length\u5462\uff1f
\n\u56e0\u6b64\uff0c\u6b64\u5904\u6211\u4eec\u4e0d\u60f3\u8981\u6536\u96c6length\u3002
\n\u540c\u6837\uff0c\u6709\u4e24\u4e2a\u65b9\u6cd5\uff1a<\/p>\n\n- \u5c06\u4f1a\u5bf9\u6570\u7ec4\u4ea7\u751f\u6539\u52a8\u7684\u65b9\u6cd5\u5168\u90e8\u91cd\u5199\u3002<\/li>\n
- \u8c03\u7528\u65b9\u6cd5\u671f\u95f4\uff0c\u6682\u505c\u4f9d\u8d56\u6536\u96c6\u3002\uff08VUE\uff09
\n\u7b2c\u4e00\u79cdemmm\uff0c\u7eaf\u91cd\u5199\uff0c\u95ee\u9898\u5f88\u5927\uff0c\u9009\u7b2c\u4e8c\u79cd<\/li>\n<\/ol>\n\/\/ handlers.js\n...\n["push", "pop", "shift", "unshift", "splice"].forEach(key => {\n arrayInstrumentations[key] = function(...args) {\n pauseTracking(); \/\/ \u6682\u505c\u4f9d\u8d56\u6536\u96c6\n const res = Array.prototype[key].apply(this, args);\n resumeTracking(); \/\/ \u6062\u590d\u4f9d\u8d56\u6536\u96c6\n return res;\n };\n});\n...\n<\/code><\/pre>\n\/\/ effect.js\n...\nlet shouldTrack = false;\n\n\/\/ Description: \u6682\u505c\u4f9d\u8d56\u6536\u96c6\nexport function pauseTracking() {\n shouldTrack = false;\n}\n\n\/\/ Description: \u6062\u590d\u4f9d\u8d56\u6536\u96c6\nexport function resumeTracking() {\n shouldTrack = true;\n}\n\n\/\/ Description: \u4f9d\u8d56\u6536\u96c6\nexport function track(target, type, key) {\n if (!shouldTrack) {\n \/\/ \u4e0d\u9700\u8981\u4f9d\u8d56\u6536\u96c6\n return;\n }\n ...\n}\n...\n<\/code><\/pre>\n\n\u5f53\u7136\u8fd8\u6709\u8bb8\u591a\u7ec6\u8282
\n\u9664\u4e86\u6570\u7ec4\u8fd8\u6709Map\uff0cSet\u7b49...<\/p>\n<\/blockquote>\n
\u5173\u8054\u6570\u636e\u548c\u51fd\u6570<\/h1>\n\u4ebf\u4e9b\u5904\u7406<\/h2>\n\/\/ effect.js\nimport { TrackOpTypes, TriggerOpTypes } from ".\/operations.js";\n\nconst targetMap = new WeakMap();\n\nconst ITERATE_KEY = Symbol('iterate');\n\nlet activeEffect;\n\nexport function effect(fn) {\n const effectfn = () => {\n try {\n activeEffect = effectfn;\n return fn();\n }\n finally {\n activeEffect = null;\n }\n }\n effectfn();\n}\n\nlet shouldTrack = false;\n\n\/\/ Description: \u6682\u505c\u4f9d\u8d56\u6536\u96c6\nexport function pauseTracking() {\n shouldTrack = false;\n}\n\n\/\/ Description: \u6062\u590d\u4f9d\u8d56\u6536\u96c6\nexport function resumeTracking() {\n shouldTrack = true;\n}\n\n\/\/ Description: \u4f9d\u8d56\u6536\u96c6\nexport function track(target, type, key) {\n if (!shouldTrack || !activeEffect) {\n \/\/ \u4e0d\u9700\u8981\u4f9d\u8d56\u6536\u96c6\n return;\n }\n \/\/ \u4f9d\u8d56\u6536\u96c6\n if (type === TrackOpTypes.ITERATE) {\n console.log(`%c\u4f9d\u8d56\u6536\u96c6\uff1a[${type}]`, 'color: red');\n }\n else {\n console.log(`%c\u4f9d\u8d56\u6536\u96c6\uff1a[${type}] `, 'color: red', key);\n }\n}\n\n\/\/ Description: \u6d3e\u53d1\u66f4\u65b0\nexport function trigger(target, type, key) {\n \/\/ \u6d3e\u53d1\u66f4\u65b0\n console.log(`%c\u6d3e\u53d1\u66f4\u65b0\uff1a[${type}] `, 'color: blue', key);\n}\n<\/code><\/pre>\ntargetMap \u7ed3\u6784\uff1a
\ntargetMap<\/p>\n
\n- \u5bf9\u8c611\uff1apropMap<\/li>\n
- \u5bf9\u8c612\uff1apropMap\n
\n- \u5c5e\u60271\uff1atypeMap<\/li>\n
- \u5c5e\u60272\uff1atypeMap\n
\n- get\uff1adep<\/li>\n
- has\uff1adep\n
\n- fn1<\/li>\n
- fn2<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
\u4f9d\u8d56\u6536\u96c6<\/h2>\nexport function track(target, type, key) {\n if (!shouldTrack || !activeEffect) {\n \/\/ \u4e0d\u9700\u8981\u4f9d\u8d56\u6536\u96c6\n return;\n }\n\n let propMap = targetMap.get(target);\n if (!propMap) {\n propMap = new Map();\n targetMap.set(target, propMap);\n }\n if (type === TrackOpTypes.ITERATE) {\n key = ITERATE_KEY;\n }\n let typeMap = propMap.get(key);\n if (!typeMap) {\n typeMap = new Map();\n propMap.set(key, typeMap);\n }\n let depSet = typeMap.get(type);\n if (!depSet) {\n depSet = new Set();\n typeMap.set(type, depSet);\n }\n if (!depSet.has(activeEffect)) {\n depSet.add(activeEffect);\n }\n}\n<\/code><\/pre>\n\u6d3e\u53d1\u66f4\u65b0<\/h2>\nexport function trigger(target, type, key) {\n \/\/ \u6d3e\u53d1\u66f4\u65b0\n const effectfns = getEffectFns(target, type, key);\n if (effectfns) {\n for (const effectfn of effectfns) {\n effectfn();\n }\n }\n\n \/\/ console.log(`%c\u6d3e\u53d1\u66f4\u65b0\uff1a[${type}] `, 'color: blue', key);\n}\n\nfunction getEffectFns(target, type, key) {\n const propMap = targetMap.get(target);\n if (!propMap) {\n return;\n }\n const keys = [key];\n if (type === TriggerOpTypes.ADD || type === TriggerOpTypes.DELETE) {\n keys.push(ITERATE_KEY);\n }\n const effectFns = new Set();\n const triggerTypeMap = {\n [TriggerOpTypes.SET]: [TrackOpTypes.GET],\n [TriggerOpTypes.ADD]: [TrackOpTypes.ITERATE, TrackOpTypes.HAS, TrackOpTypes.GET],\n [TriggerOpTypes.DELETE]: [TrackOpTypes.ITERATE, TrackOpTypes.HAS, TrackOpTypes.GET],\n };\n \n for (let key of keys) {\n const typeMap = propMap.get(key);\n if (!typeMap) {\n continue;\n }\n const trackTypes = triggerTypeMap[type];\n for (const trackType of trackTypes) {\n const depSet = typeMap.get(trackType);\n if (depSet) {\n depSet.forEach(effect => {\n effectFns.add(effect);\n });\n }\n }\n }\n \n return effectFns;\n}\n<\/code><\/pre>\n\u4ebf\u4e9bbug<\/h2>\n
\u4e00\uff1a<\/p>\n
let state = reactive({\n a: 1,\n b: 2,\n c: 3\n});\n\nfunction fn1() {\n console.log('fn1 run');\n if (state.a === 3) {\n state.b;\n }\n else {\n state.c;\n }\n}\n\neffect(fn1);\n\nconsole.log('---------');\nstate.c = 3;\nconsole.log('---------');\nstate.a = 3;\nconsole.log('---------');\nstate.b = 4;\nconsole.log('---------');\nstate.c = 5;\nconsole.log('---------');\n<\/code><\/pre>\n\u5f53\u6211\u4eec\u5c06a\u7684\u503c\u6539\u4e86\u540e\uff0c\u8fd0\u884cfn1\uff0c\u5e94\u8be5\u91cd\u65b0\u6536\u96c6a,b,\u5220\u9664c\uff0c\u4f46\u662f\u6700\u540e\u4fee\u6539c\u53d1\u73b0\u51fd\u6570\u53c8\u8fd0\u884c\u4e86\u3002\u6211\u4eec\u5e76\u672a\u5904\u7406\u5220\u9664c\u3002<\/p>\n
\u4e8c\uff1a<\/p>\n
let state2 = reactive([1, 2, 3]);\n\nfunction fn3() {\n console.log('fn3 run');\n effect(() => {\n console.log('inner run');\n state2[1];\n });\n state2[2];\n}\n\neffect(fn3);\n\nconsole.log('---------');\nstate2[1] = 3;\nconsole.log('---------');\nstate2[2] = 4;\nconsole.log('---------');\n<\/code><\/pre>\n\u4fee\u6539\u4e0b\u68072\u65f6\u5e94\u8be5\u89e6\u53d1fn3\u8fd0\u884c\uff0c\u4f46\u53d1\u73b0fn3\u5e76\u672a\u8fd0\u884c\u3002
\n\u6211\u4eec\u53ea\u4f7f\u7528\u4e86\u4e00\u4e2aactiveEffect\u6765\u50a8\u5b58\uff0c\u5728\u5185\u90e8\u51fd\u6570\u8fd0\u884c\u540e\uff0cactiveEffect\u88ab\u8bbe\u7f6e\u4e3anull\uff0c\u5bfc\u81f4\u4e0b\u68072\u672a\u88ab\u6536\u96c6\u3002
\n\u6267\u884c\u6808\u95ee\u9898\u3002\u6dfb\u52a0\u6808\u5904\u7406\u3002<\/p>\n
\u4e09\uff1a<\/p>\n
let state2 = reactive([1, 2, 3]);\n\nfunction fn4() {\n console.log('fn4 run');\n state2[1]++;\n}\n\neffect(fn4);\n<\/code><\/pre>\n\u7206\u6808\uff0c\u5224\u65ad\u4e00\u4e0b\u5373\u53ef\u3002<\/p>\n
\u56db\uff1a<\/p>\n
let state2 = reactive([1, 2, 3]);\n\nfunction fn2() {\n console.log('fn2 run');\n if (state2.length > 3) {\n state2[2];\n }\n else {\n state2[1];\n }\n}\n\neffect(fn2);\n\nconsole.log('---------');\nstate2[1] = 3;\nconsole.log('---------');\nstate2.push(4);\nconsole.log('---------');\nstate2[2] = 5;\nconsole.log('---------');\n<\/code><\/pre>\n\u6309\u7406\u8bf4\uff0c\u4fee\u6539\u4e0b\u68072\u65f6\uff0c\u7531\u4e8e\u524d\u9762push\uff0clength\u5927\u4e8e3\u540e\uff0c\u6536\u96c6\u7684\u4f9d\u8d56\u5e94\u8be5\u662f\u4e0b\u68072\u548clength\uff0c\u4f46\u662f\u6700\u540e\u4fee\u6539\u4e0b\u68072\u5374\u6ca1\u6709\u89e6\u53d1\u66f4\u65b0\u3002\u539f\u56e0\u662fpush\u8fc7\u7a0b\u4e2d\u6682\u505c\u4e86\u4f9d\u8d56\u6536\u96c6\uff0c\u5bfc\u81f4\u5e76\u6ca1\u6709\u6536\u96c6\u5230\u4e0b\u68072\u7684\u4f9d\u8d56\u3002<\/p>\n
......<\/p>\n
\u8865\u5145\u5b9e\u73b0<\/h1>\nref<\/h2>\n\/\/ ref.js\nimport { TrackOpTypes, TriggerOpTypes } from ".\/operations.js";\nimport { track, trigger } from ".\/effect.js";\n\nexport function ref(value) {\n return {\n get value() {\n track(this, TrackOpTypes.GET, "value");\n return value;\n },\n set value(newValue) {\n value = newValue;\n trigger(this, TriggerOpTypes.SET, "value", newValue);\n }\n };\n}\n<\/code><\/pre>\n\u6d4b\u8bd5\uff1a<\/p>\n
import { reactive } from ".\/reactive.js";\nimport { effect } from ".\/effect.js";\nimport { ref } from ".\/ref.js";\n\nconst state = ref(1);\n\neffect(() => {\n console.log("effect", state.value);\n})\n\nstate.value++;\n<\/code><\/pre>\ncomputed<\/h2>\n\/\/ computed.js\nimport { effect } from ".\/effect.js";\nimport { track, trigger } from ".\/effect.js";\nimport { TrackOpTypes, TriggerOpTypes } from ".\/operations.js";\n\nfunction normalizeParameters(getterOrOptions) {\n let getter, setter;\n if (typeof getterOrOptions === 'function') {\n getter = getterOrOptions;\n setter = () => {\n console.warn('computed() received a function but no setter.')\n }\n }\n else {\n getter = getterOrOptions.get;\n setter = getterOrOptions.set;\n }\n return { getter, setter };\n}\n\nexport function computed(getterOrOptions) {\n const { getter, setter } = normalizeParameters(getterOrOptions);\n let value, dirty = true;\n const effectfn = effect(getter, { \n lazy: true,\n scheduler: () => {\n dirty = true;\n trigger(computed, TriggerOpTypes.SET, 'value');\n }\n });\n return {\n get value() {\n track(computed, TrackOpTypes.GET, 'value');\n if (dirty) {\n value = effectfn();\n dirty = false;\n }\n return value;\n },\n set value(newValue) {\n setter(newValue);\n }\n }\n}\n<\/code><\/pre>\n\u6d4b\u8bd5\uff1a<\/p>\n
import { reactive } from ".\/reactive.js";\nimport { effect } from ".\/effect.js";\nimport { ref } from ".\/ref.js";\nimport { computed } from ".\/computed.js";\n\nconst state = reactive({\n a: 1,\n b: 2,\n c: 3\n});\n\nconst sum = computed(() => {\n console.log('computed run');\n return state.a + state.b + state.c;\n});\n\nsum.value;\nsum.value;\nsum.value;\nsum.value;\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"\u57fa\u7840\u5206\u6790 \u76d1\u542c\u6570\u636e\u7684\u8bfb\u53d6\u548c\u4fee\u6539 js\u4e2d\u6709\u4e24\u4e2a\u65b9\u6cd5\u53ef\u4ee5\u76d1\u542c\u5bf9\u8c61\uff1a defineProperty \u76d1\u542c\u8303\u56f4\u6bd4\u8f83\u7a84\uff0c […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[19],"tags":[],"class_list":["post-776","post","type-post","status-publish","format-standard","hentry","category-front-end"],"_links":{"self":[{"href":"https:\/\/levin.ink\/index.php?rest_route=\/wp\/v2\/posts\/776","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/levin.ink\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/levin.ink\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/levin.ink\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/levin.ink\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=776"}],"version-history":[{"count":1,"href":"https:\/\/levin.ink\/index.php?rest_route=\/wp\/v2\/posts\/776\/revisions"}],"predecessor-version":[{"id":777,"href":"https:\/\/levin.ink\/index.php?rest_route=\/wp\/v2\/posts\/776\/revisions\/777"}],"wp:attachment":[{"href":"https:\/\/levin.ink\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=776"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/levin.ink\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=776"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/levin.ink\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=776"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
![\"Pasted](\"https:\/\/levin.ink\/wp-content\/uploads\/2024\/07\/Pasted-image-20240706173253.png\")
<\/div>![\"Pasted](\"https:\/\/levin.ink\/wp-content\/uploads\/2024\/07\/Pasted-image-20240706181415.png\")
<\/div>![\"Pasted](\"https:\/\/levin.ink\/wp-content\/uploads\/2024\/07\/Pasted-image-20240706222136.png\")
<\/div>![\"Pasted](\"https:\/\/levin.ink\/wp-content\/uploads\/2024\/07\/Pasted-image-20240707150446.png\")
<\/div>![\"Pasted](\"https:\/\/levin.ink\/wp-content\/uploads\/2024\/07\/Pasted-image-20240707150559.png\")
<\/div>![\"Pasted](\"https:\/\/levin.ink\/wp-content\/uploads\/2024\/07\/Pasted-image-20240707150727.png\")
<\/div>![\"Pasted](\"https:\/\/levin.ink\/wp-content\/uploads\/2024\/07\/Pasted-image-20240707151258.png\")
<\/div>![\"Pasted](\"https:\/\/levin.ink\/wp-content\/uploads\/2024\/07\/Pasted-image-20240707151452.png\")
<\/div>![\"Pasted](\"https:\/\/levin.ink\/wp-content\/uploads\/2024\/07\/Pasted-image-20240707153224.png\")
<\/div>![\"Pasted](\"https:\/\/levin.ink\/wp-content\/uploads\/2024\/07\/Pasted-image-20240707165836.png\")
<\/div>![\"Pasted](\"https:\/\/levin.ink\/wp-content\/uploads\/2024\/07\/Pasted-image-20240707171315.png\")
<\/div>![\"Pasted](\"https:\/\/levin.ink\/wp-content\/uploads\/2024\/07\/Pasted-image-20240707165836-1.png\")
<\/div>