{"id":1003,"date":"2023-03-12T08:56:21","date_gmt":"2023-03-12T00:56:21","guid":{"rendered":"https:\/\/www.appblog.cn\/?p=1003"},"modified":"2023-04-29T13:18:43","modified_gmt":"2023-04-29T05:18:43","slug":"vue-data-binding-array-not-updating-view-when-changing-elements-issue","status":"publish","type":"post","link":"https:\/\/www.appblog.cn\/index.php\/2023\/03\/12\/vue-data-binding-array-not-updating-view-when-changing-elements-issue\/","title":{"rendered":"Vue\u6570\u636e\u7ed1\u5b9a\u6570\u7ec4\uff0c\u6539\u53d8\u5143\u7d20\u65f6\u4e0d\u66f4\u65b0view\u95ee\u9898"},"content":{"rendered":"

\u95ee\u9898\u63cf\u8ff0<\/h2>\n

\u5173\u4e8e\u8fd9\u4e2a\u95ee\u9898\uff0cVue\u5b98\u65b9\u6587\u6863<\/a>\u4e0a\u8bf4\u7684\u5f88\u6e05\u695a<\/p>\n

\u7531\u4e8e JavaScript \u7684\u9650\u5236\uff0cVue \u4e0d\u80fd\u68c0\u6d4b\u4ee5\u4e0b\u53d8\u52a8\u7684\u6570\u7ec4\uff1a<\/p>\n

    \n
  1. \u5f53\u4f60\u5229\u7528\u7d22\u5f15\u76f4\u63a5\u8bbe\u7f6e\u4e00\u4e2a\u9879\u65f6\uff0c\u4f8b\u5982\uff1avm.items[indexOfItem] = newValue<\/code><\/li>\n
  2. \u5f53\u4f60\u4fee\u6539\u6570\u7ec4\u7684\u957f\u5ea6\u65f6\uff0c\u4f8b\u5982\uff1avm.items.length = newLength<\/code><\/li>\n<\/ol>\n

    <\/p>\n

    \u4e3e\u4e2a\u4f8b\u5b50\uff1a<\/p>\n

    var vm = new Vue({\n  data: {\n    items: ['a', 'b', 'c']\n  }\n})\nvm.items[1] = 'x' \/\/ \u4e0d\u662f\u54cd\u5e94\u6027\u7684\nvm.items.length = 2 \/\/ \u4e0d\u662f\u54cd\u5e94\u6027\u7684<\/code><\/pre>\n
    \u4e3a\u4e86\u89e3\u51b3\u7b2c\u4e00\u7c7b\u95ee\u9898\uff0c\u4ee5\u4e0b\u4e24\u79cd\u65b9\u5f0f\u90fd\u53ef\u4ee5\u5b9e\u73b0\u548c vm.items[indexOfItem] = newValue<\/code> \u76f8\u540c\u7684\u6548\u679c\uff0c\u540c\u65f6\u4e5f\u5c06\u89e6\u53d1\u72b6\u6001\u66f4\u65b0\uff1a<\/p>\n
    \/\/ Vue.set\nVue.set(vm.items, indexOfItem, newValue)<\/code><\/pre>\n
    \/\/ Array.prototype.splice\nvm.items.splice(indexOfItem, 1, newValue)<\/code><\/pre>\n
    this.items = JSON.parse(JSON.stringify(this.items))<\/code><\/pre>\n
    \u4f60\u4e5f\u53ef\u4ee5\u4f7f\u7528 vm.$set<\/code> \u5b9e\u4f8b\u65b9\u6cd5\uff0c\u8be5\u65b9\u6cd5\u662f\u5168\u5c40\u65b9\u6cd5 Vue.set<\/code> \u7684\u4e00\u4e2a\u522b\u540d\uff1a<\/p>\n
    vm.$set(vm.items, indexOfItem, newValue)<\/code><\/pre>\n
    \u4e3a\u4e86\u89e3\u51b3\u7b2c\u4e8c\u7c7b\u95ee\u9898\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528 splice\uff1a<\/p>\n
    vm.items.splice(newLength)<\/code><\/pre>\n
    \u793a\u4f8b\u8bf4\u660e<\/h2>\n
    <body>\n  <div class="box">\n    <div v-for="a in arr">{{a}}<\/div>\n    <button @click="change">\u5237\u65b0\u56fd\u5bb6<\/button>\n  <\/div>\n<\/body><\/code><\/pre>\n
    var vm = new Vue({\n  el: '.box',\n  data: {\n    arr: ['china', 'america', 'russia', 'europe']\n  },\n  methods: {\n    change () {\n      \/\/ \u70b9\u51fb\u6309\u94ae\u65f6\uff0c\u6539\u53d8arr\u7684\u6700\u540e\u4e00\u4e2a\u5143\u7d20\n      \/\/ \u6570\u636e\u53d8\u4e86\uff0c\u4f46\u662fview\u6ca1\u6709\u66f4\u65b0\n      this.arr[3] = 'hangzhou'\n    }\n  }\n})<\/code><\/pre>\n
    \u56e0\u4e3aVue\u5b9e\u73b0\u53cc\u5411\u6570\u636e\u7ed1\u5b9a\u7684\u673a\u5236\u662f\u6570\u636e\u52ab\u6301\uff0c\u4e5f\u5c31\u662f\u5728\u6240\u6709\u5bf9\u8c61\u4e0a\u6709\u4e2aObject.defineProperty()\u65b9\u6cd5\uff0c\u901a\u8fc7\u76d1\u542cset\u4e0eget\u65b9\u6cd5\u53bb\u5b9e\u73b0\uff0c\u800c\u6570\u7ec4\u6ca1\u6709\u8fd9\u4e24\u4e2a\u65b9\u6cd5\uff0c\u6240\u4ee5\u5c31\u4e0d\u4f1a\u66f4\u65b0view\u3002\u89e3\u51b3\u65b9\u6848\u5c31\u662f\uff0c\u9700\u8981\u6211\u4eec\u4e3b\u52a8\u901a\u77e5Vue\u3002<\/p>\n
      \n
    • \u89e3\u51b3\u65b9\u68481<\/li>\n<\/ul>\n
      methods: {\n  change () {\n    this.arr[3] = 'hangzhou'\n    \/\/ \u5728vm\u5b9e\u4f8b\u4e0a\u901a\u77e5\n    vm.$set(this.arr, 3, this.arr[3])\n  }\n}<\/code><\/pre>\n
        \n
      • \u89e3\u51b3\u65b9\u68482<\/li>\n<\/ul>\n
        methods: {\n  change () {\n    this.arr[3] = 'hangzhou'\n    \/\/ \u5728\u5168\u5c40\u5bf9\u8c61\u4e0a\u901a\u77e5\n    Vue.set(this.arr, 3, this.arr[3])\n  }\n}<\/code><\/pre>\n
          \n
        • \u89e3\u51b3\u65b9\u68483<\/li>\n<\/ul>\n
          methods: {\n  change () {\n    \/\/ vue\u672c\u8eab\u53ef\u4ee5\u76d1\u542c\u5230\u6570\u7ec4\u7684\u4e00\u4e9b\u65b9\u6cd5\uff0c\u4f8b\u5982:\n    \/\/ push(),pop(),shift(),unshift(),splice(),sort(),reverse()\n    this.arr.splice(3, 1, 'hangzhou')\n  }\n}<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
          \u95ee\u9898\u63cf\u8ff0 \u5173\u4e8e\u8fd9\u4e2a\u95ee\u9898\uff0cVue\u5b98\u65b9\u6587\u6863\u4e0a\u8bf4\u7684\u5f88\u6e05\u695a \u7531\u4e8e JavaScript \u7684\u9650\u5236\uff0cVue \u4e0d\u80fd\u68c0\u6d4b\u4ee5\u4e0b\u53d8 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[35],"tags":[],"class_list":["post-1003","post","type-post","status-publish","format-standard","hentry","category-vue"],"_links":{"self":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts\/1003","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/comments?post=1003"}],"version-history":[{"count":0,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts\/1003\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/media?parent=1003"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/categories?post=1003"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/tags?post=1003"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}