{"id":835,"date":"2024-08-31T18:03:58","date_gmt":"2024-08-31T10:03:58","guid":{"rendered":"https:\/\/levin.ink\/?p=835"},"modified":"2024-08-31T18:03:58","modified_gmt":"2024-08-31T10:03:58","slug":"vue-6-5-vue3-0","status":"publish","type":"post","link":"https:\/\/levin.ink\/?p=835","title":{"rendered":"VUE – 6-5 VUE3.0"},"content":{"rendered":"

VUE2.0 vs VUE3.0<\/h1>\n

\u521b\u5efa<\/h2>\n
import App from ".\/App.vue"\n\n\/\/ vue2\n\/\/ import Vue from "vue";\n\/\/ const app = new Vue(options)\n\/\/ app.$mount("#app")\n\n\/\/ vue3\nimport { creatApp } from "vue";\nconst app = createApp(App);\napp.mount(#app);\n\n<\/code><\/pre>\n
\u4f7f\u7528\u63d2\u4ef6<\/h2>\n
\/\/ vue2\n\/\/ Vue.use(xxx);\n\n\/\/ vue3\napp.use(xxx);\n<\/code><\/pre>\n
\u7ec4\u4ef6<\/h2>\n
vue2\u4e2d\uff0cthis\u6307\u5411\u5f53\u524d\u7ec4\u4ef6\u5b9e\u4f8b\uff0c\u800c\u5728vue3\u4e2d\uff0cthis\u6307\u5411\u5f53\u524d\u7ec4\u4ef6\u5b9e\u4f8b\u7684\u4ee3\u7406\u5bf9\u8c61\u3002
\n\u7528\u6cd5\u6ca1\u6709\u533a\u522b\u3002<\/p>\n
compositon api \u4e0e option api<\/h2>\n
vue2\u4e2d\u4f7f\u7528option api\uff0c\u5728\u590d\u6742\u903b\u8f91\u7684\u7ec4\u4ef6\u4e2d\uff0c\u76f8\u540c\u529f\u80fd\u7684\u4ee3\u7801\u5206\u6563\u5230\u4e0d\u540c\u7684\u4ee3\u7801\u5757\uff0c\u800c\u5728vue3\u4e2d\u4f7f\u7528\u4e86composition api\uff0c\u76f8\u540c\u7684\u529f\u80fd\u4ee3\u7801\u7ed3\u5408\u5230\u4e00\u8d77\u3002<\/p>\n
\u540c\u6837\u5730\uff0cvue3\u4e2d\u652f\u6301vue2\u7684\u5199\u6cd5\uff1a<\/p>\n
<template>\n    <div>\n        <button @click="increase">count: {{ count }}<\/button>\n    <\/div>\n<\/template>\n\n<script>\n\nexport default {\n    data() {\n        return {\n            count: 0\n        };\n    },\n    methods: {\n        increase() {\n            this.count++;\n        }\n    }\n};\n<\/script>\n<\/code><\/pre>\n
vue3\u7684\u5199\u6cd5:
\n\u63d0\u4f9b\u4e00\u4e2asetup\u51fd\u6570\uff0c\u5728\u6240\u6709\u751f\u547d\u5468\u671fhook\u4e4b\u524d\u8c03\u7528\uff0c\u51fd\u6570\u4e2d\u7684this\u6307\u5411undefined\uff0c\u51fd\u6570\u8fd4\u56de\u7684\u6570\u636e\u5c06\u88ab\u6302\u8f7d\u5230\u7ec4\u4ef6\u5b9e\u4f8b\u4e0a\u3002<\/p>\n
<template>\n    <div>\n        <button @click="increase">count: {{ count }}<\/button>\n    <\/div>\n<\/template>\n\n<script>\n\nexport default {\n    setup() {\n\t    let count = 0;\n\t    const increast = () => {\n\t\t    count++;\n\t    }\n\t    return {\n\t\t    count,\n\t\t    increase\n\t    }\n    }\n};\n<\/script>\n<\/code><\/pre>\n
\u6b64 ref \u975e\u5f7c $ref<\/h3>\n
\u4f46\u53d1\u73b0\u9875\u9762\u5e76\u6ca1\u6709\u53d8\u5316\uff0c\u8fd9\u662f\u56e0\u4e3a\u6570\u636e\u6ca1\u6709\u54cd\u5e94\u5f0f\uff0cvue3\u63d0\u4f9b\u4e86ref\u51fd\u6570\uff1a<\/p>\n
<template>\n    <div>\n        <button @click="increase">count: {{ count }}<\/button>\n    <\/div>\n<\/template>\n\n<script>\nimport { ref } from "vue";\nexport default {\n    setup() {\n\t    let count = ref(0);\n\t    const increast = () => {\n\t\t    count++;\n\t    }\n\t    return {\n\t\t    count,\n\t\t    increase\n\t    }\n    }\n};\n<\/script>\n<\/code><\/pre>\n
\u8fd9\u4e0b\u6ca1\u95ee\u9898\u4e86\uff0c\u5bf9...\u5427\uff1f
\n\u6253\u5370ref\u521b\u5efa\u7684count\u53ef\u4ee5\u53d1\u73b0\uff0ccount\u662f\u4e00\u4e2a\u5bf9\u8c61\uff0c\u5176\u4e2d\u6709\u4e2agetter\u4e3avalue\uff0c\u8fd9\u624d\u662f\u6211\u4eec\u7684\u6570\u636e\uff0c\u4f46\u4e3a\u4ec0\u4e48\u5916\u90e8\u53ef\u4ee5\u4f7f\u7528{{ count }}<\/code>\u76f4\u63a5\u8bbf\u95ee\u6570\u636e\u5462\uff0c\u751a\u81f3{{ typeof count }}<\/code>\u8f93\u51fa\u7684\u662fNumber\uff01
\nvue\u4e3a\u4e86\u4f7f\u7528\u65b9\u4fbf\uff08\u800c\u4e0d\u662f\u6bcf\u4e2a\u6570\u636e\u90fd.value\uff09\uff0c\u5e2e\u6211\u4eec\u505a\u4e86\u8fd9\u4ef6\u4e8b\u5f53\u6211\u4eec\u8bbf\u95ee\u5f53\u524d\u7ec4\u4ef6\u5bf9\u8c61\uff08\u4ee3\u7406\u5bf9\u8c61\uff09\u65f6\uff0c\u4ee3\u7406\u53d1\u73b0\u6211\u4eec\u8bbf\u95ee\u7684\u662f\u67d0\u4e2a\u54cd\u5e94\u5f0f\u6570\u636e\uff0c\u4f1a\u5e2e\u6211\u4eec\u53bb\u7ec4\u4ef6\u5bf9\u8c61\u4e2d\u53d6\u8be5\u6570\u636e\u7684.value\uff0c\u56e0\u6b64\u5728\u5916\u90e8\u4f7f\u7528\u65e0\u4efb\u4f55\u5f71\u54cd\u3002
\n\u4f46\u662f\u5728setup()\u51fd\u6570\u4e2d\uff0c\u6211\u4eec\u4f9d\u65e7\u4e0d\u5f97\u4e0d\u4f7f\u7528.value\u6765\u4fee\u6539\u6570\u636e\uff1a<\/p>\n
<template>\n    <div>\n        <button @click="increase">count: {{ count }}<\/button>\n    <\/div>\n<\/template>\n\n<script>\nimport { ref } from "vue";\nexport default {\n    setup() {\n\t    let count = ref(0);\n\t    const increast = () => {\n\t\t    count.value++;\n\t    }\n\t    return {\n\t\t    count,\n\t\t    increase\n\t    }\n    }\n};\n<\/script>\n<\/code><\/pre>\n
\n
vue\u5efa\u8bae\u7528ref\u5b9a\u4e49\u7684\u54cd\u5e94\u5f0f\u6570\u636e\u52a0\u4e0a\u4e00\u4e2aRef\u505a\u533a\u5206
\nlet countRef = ref(0);<\/code><\/p>\n<\/blockquote>\n
\u5728\u590d\u6742\u7684\u529f\u80fd\u7ec4\u4ef6\u4e2d\uff1a<\/p>\n
<template>\n    <button @click="decrease">-<\/button>\n    <div>{{ countRef }}<\/div>\n    <button @click="increase">+<\/button>\n<\/template>\n\n<script>\nimport { ref } from 'vue';\n\nfunction useCount() {\n    let countRef = ref(0);\n    const increase = () => {\n        countRef.value++;\n    };\n    const decrease = () => {\n        countRef.value--;\n    };\n    return {\n        countRef,\n        increase,\n        decrease\n    };\n}\n\n\/\/ ...\n\nexport default {\n    setup() {\n        return {\n            ...useCount(),\n            \/\/ ...\n        };\n    }\n};\n<\/script>\n\n<\/code><\/pre>\n
\u66f4\u591a\u5730\uff0cuseCount\u53ef\u4ee5\u8fdb\u4e00\u6b65\u8131\u79bb\u6210\u4e00\u4e2a\u6587\u4ef6\u5bfc\u51fa<\/p>\n
\n
\u5728vue3\u4e2d\uff0c\u6839\u8282\u70b9\u53ef\u4ee5\u4e0d\u552f\u4e00<\/p>\n<\/blockquote>\n
watch \u4e0e watchEffect<\/h2>\n
\u5728vue3\u4e2d\uff0c\u63d0\u4f9b\u4e86watchEffect\u51fd\u6570\u6765\u76d1\u63a7\u6570\u636e\u53d8\u5316\uff0c\u53ea\u9700\u4f20\u5165\u4e00\u4e2a\u51fd\u6570\uff0cvue\u5c06\u4f1a\u5bf9\u8fd9\u4e2a\u51fd\u6570\u8fdb\u884c\u4f9d\u8d56\u6536\u96c6\uff0c\u5f53\u6536\u96c6\u5230\u7684\u6570\u636e\u53d8\u5316\u65f6\uff0cvue\u4f1a\u81ea\u52a8\u8c03\u7528\u8be5\u51fd\u6570\uff1a<\/p>\n
import { ref, watchEffect } from 'vue';\n\nexport default function useTodoList() {\n    const todosRef = ref(getTasks());\n    watchEffect(() => {\n        saveTasks(todosRef.value);\n    });\n    return {\n        todosRef,\n    }\n};\n<\/code><\/pre>\n
\u5f53watchEffect\u4f20\u5165\u7684\u51fd\u6570\u7684\u4f9d\u8d56\u6570\u636etodosRef\u53d8\u5316\u65f6\uff0c\u4fbf\u8c03\u7528\u8be5\u51fd\u6570\uff0c\u4fdd\u5b58\u6570\u636e\u3002<\/p>\n
Hook<\/h2>\n
\u5728vue3\u4e2d\uff0c\u751f\u547d\u5468\u671f\u94a9\u5b50\u540c\u6837\u7531\u51fd\u6570\u63d0\u4f9b\uff0c\u53ef\u4ee5\u4ecevue\u4e2d\u5bfc\u5165onMounted, onUnmounted\u7b49\u94a9\u5b50\u51fd\u6570\uff0c\u4f20\u5165\u4e00\u4e2a\u51fd\u6570\uff0c\u5230\u5bf9\u5e94\u751f\u547d\u5468\u671f\u65f6\u4fbf\u4f1a\u8c03\u7528\u6267\u884c\u3002<\/p>\n
import { onMounted, onUnmounted } from 'vue'\n\nexport default function usexxx() {\n\tonMounted(() => {\n        window.addEventListener('hashchange', onHashChange);\n    });\n\n    onUnmounted(() => {\n        window.removeEventListener('hashchange', onHashChange);\n    });\n}\n<\/code><\/pre>\n
computed \u4e0e computed<\/h2>\n
vue3\u4e2d\u7684computed\u4f9d\u65e7\u662f\u4ee5\u51fd\u6570\u5f62\u5f0f\u63d0\u4f9b\uff0c\u6709\u4e24\u79cd\u53c2\u6570\u4f20\u9012\u65b9\u5f0f\u3002
\n\u4e0d\u7ba1\u600e\u6837\uff0c\u8fd4\u56de\u7684\u90fd\u662f\u4e00\u4e2a\uff08\u7c7b\u4f3c\uff09ref\u5305\u88c5\u540e\u7684\u54cd\u5e94\u5f0f\u6570\u636e\uff0c\u548cref\u6570\u636e\u540c\u6837\u7684\u4f7f\u7528\u65b9\u6cd5\u3002<\/p>\n
\u4f20\u5165\u51fd\u6570<\/h3>\n
\u9ed8\u8ba4\u4f20\u5165\u7684\u51fd\u6570\u4e3agetter<\/p>\n
import { computed } from 'vue'\n\nexport default function usexxx() {\n\tconst filteredTodosRef = computed(() => {\n        return filter(todosRef.value, visibilityRef.value);\n    })\n    const remainingRef = computed(() => {\n        return filter(todosRef.value, 'active').length;\n    });\n    const completedRef = computed(() => {\n        return filter(todosRef.value, 'completed').length;\n    });\n    \/\/ ...\n}\n<\/code><\/pre>\n
\u4f20\u5165\u5bf9\u8c61<\/h3>\n
\u4f20\u5165\u5bf9\u8c61\u65f6\uff0c\u5bf9\u8c61\u4e2d\u63d0\u4f9bgetter\u548csetter\u65b9\u6cd5<\/p>\n
import { computed } from 'vue'\n\nexport default function usexxx() {\n\tconst allDone = computed({\n\t\tget() {\n\t\t\treturn remainingRef === 0;\n\t\t},\n\t\tset(state) {\n\t\t\ttodosRef.forEach(todo => {\n\t\t\t\ttodo.completed = state;\n\t\t\t})\n\t\t}\n\t});\n\t\/\/ ...\n}\n<\/code><\/pre>\n
\u5728vue\u6587\u6863\u4e2d\u63d0\u5230\u4ee5\u4e0b\u5185\u5bb9\uff0c\u8ba1\u7b97\u5c5e\u6027\u7684\u8fd4\u56de\u503c\u5e94\u8be5\u88ab\u89c6\u4e3a\u53ea\u8bfb\u7684\uff0c\u662f\u5426\u610f\u5473\u7740\u8ba1\u7b97\u5c5e\u6027\u4e0d\u5e94\u8be5\u62e5\u6709setter\u3002<\/p>\n
\n
\u907f\u514d\u76f4\u63a5\u4fee\u6539\u8ba1\u7b97\u5c5e\u6027\u503c\u200b<\/a>
\n\u4ece\u8ba1\u7b97\u5c5e\u6027\u8fd4\u56de\u7684\u503c\u662f\u6d3e\u751f\u72b6\u6001\u3002\u53ef\u4ee5\u628a\u5b83\u770b\u4f5c\u662f\u4e00\u4e2a\u201c\u4e34\u65f6\u5feb\u7167\u201d\uff0c\u6bcf\u5f53\u6e90\u72b6\u6001\u53d1\u751f\u53d8\u5316\u65f6\uff0c\u5c31\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u5feb\u7167\u3002\u66f4\u6539\u5feb\u7167\u662f\u6ca1\u6709\u610f\u4e49\u7684\uff0c\u56e0\u6b64\u8ba1\u7b97\u5c5e\u6027\u7684\u8fd4\u56de\u503c\u5e94\u8be5\u88ab\u89c6\u4e3a\u53ea\u8bfb\u7684\uff0c\u5e76\u4e14\u6c38\u8fdc\u4e0d\u5e94\u8be5\u88ab\u66f4\u6539\u2014\u2014\u5e94\u8be5\u66f4\u65b0\u5b83\u6240\u4f9d\u8d56\u7684\u6e90\u72b6\u6001\u4ee5\u89e6\u53d1\u65b0\u7684\u8ba1\u7b97\u3002<\/p>\n<\/blockquote>\n","protected":false},"excerpt":{"rendered":"
VUE2.0 vs VUE3.0 \u521b\u5efa import App from ".\/App.vue&quo […]<\/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-835","post","type-post","status-publish","format-standard","hentry","category-front-end"],"_links":{"self":[{"href":"https:\/\/levin.ink\/index.php?rest_route=\/wp\/v2\/posts\/835","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=835"}],"version-history":[{"count":1,"href":"https:\/\/levin.ink\/index.php?rest_route=\/wp\/v2\/posts\/835\/revisions"}],"predecessor-version":[{"id":836,"href":"https:\/\/levin.ink\/index.php?rest_route=\/wp\/v2\/posts\/835\/revisions\/836"}],"wp:attachment":[{"href":"https:\/\/levin.ink\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=835"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/levin.ink\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=835"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/levin.ink\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=835"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}