lovecoding
/
W0407


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div id="app">
        <button @click="changeName">修改第二项的名字</button>
        <ul v-for="(item,index) in arr" :key="index">
            <li>{{index+1}}.我叫{{item.name}}--今年{{item.age}}了--我是{{item.sex}}孩</li>
        </ul>
    </div>
    <script src="./vue.js"></script>
    <script>
        var app = new Vue({
            el: "#app",
            data: {
                arr: [
                    {
                        name: "Lucy",
                        age: 11,
                        sex: "女",
                    },
                    {
                        name: "LiLi",
                        age: 31,
                        sex: "男",
                    },
                    {
                        name: "八戒",
                        age: 21,
                        sex: "男",
                    },
                    {
                        name: "八卦",
                        age: 23,
                        sex: "男",
                    },
                    {
                        name: "孙悟空",
                        age: 27,
                        sex: "男",
                    },
                    {
                        name: "唐僧",
                        age: 33,
                        sex: "女",
                    },
                ],
            },
            /**
             * Vue2响应式：Object.defineProperty()实现
             * 它只能监听对象属性的修改 无法监听数组下标直接赋值
            */
            methods: {
                changeName() {
                    // this.arr[1].name = '图图';
                    this.arr[1] = { name: "图图", age: 3 }
                    // this.$set(this.arr,1,{ name: "图图", age: 3 })
                    // Vue.set(this.arr,1,{ name: "图图", age: 3 })
                    console.log(this.arr, 'arr')
                }
            },
            computed:{},
            watch:{},
            created() {
                
            }
        })
    </script>
</body>

</html>