[javascript] view plain copy <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> <script src="vue.js"></script> <style> .blue { color: blue; } </style> </head> <body> <div id="example-1"> <ul> <template v-for="item in items"> <li> {{$index}}.{{ item.msg }} <button v-on:click="f5(item)">vm.items.splice(index, 1)</button> <button v-on:click="f6(item)">vm.remove</button> </li> </template> </ul> <ul> <li> <button v-on:click="f1">vm.items[0] = {} 失效</button> </li> <li> <button v-on:click="f2">vm.items.$set(0, { childMsg: 'Changed!'}) </button> </li> <li> <button v-on:click="f3">vm.items.length = 0 失效</button> </li> <li> <button v-on:click="f4">vm.items={}</button> </li> </ul> <div class="blue"> {{$data | json }} </div> <pre> 因为 JavaScript 的限制，Vue.js 不能检测到下面数组变化： 直接用索引设置元素，如 vm.items[0] = {}； 修改数据的长度，如 vm.items.length = 0。 </pre> </div> <script> var vm = new Vue({ el: '#example-1', data: { items: [{ msg: 'Foo' }, { msg: 'Bar' }, { msg: 'George' }] }, methods: { f1: function() { vm.items[0] = {}; // 失效 }, f2: function() { vm.items.$set(0, { childMsg: 'Changed!' }) vm.items.$set(2, { msg: 'dongtao!' }) }, f3: function() { vm.items.length = 0; // 失效 }, f4: function() { vm.items = {} }, f5: function(item) { var index = this.items.indexOf(item) //Search an array for the item if (index !== -1) { this.items.splice(index, 1) //Selects a part of an array, and returns the new array } }, f6: function(item) { this.items.$remove(item) } } }) </script> </body> </html>