lovecoding
/
VIP32


			
				
					
						
						
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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">
        <div v-for="(item,index) in arr" :key="index">
            {{item.name}}--{{item.age}}--{{item.sex}}
        </div>
        <button @click="getNews">修改数据</button>
    </div>
    <script src="./vue.js"></script>
    <script>
      var app = new Vue({
        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",
            }
          ],
        },
        methods: {
            getNews() {
                // 数据修改 视图未更新
                // Object.defineProperty 中的getter和setter去对数据进行设置和修改
                console.log("修改")
                // this.arr[2] = {name:"小郑",age: 20,sex:"女"}
                // 第一种写法
                // Vue.set(target,index/name,obj)
                Vue.set(this.arr,1,{name:"小郑",age: 20,sex:"女"})
                // 第二种写法
                this.$set(this.arr,2,{name:"小李",age: 24,sex:"男"})
                console.log(this.arr)
            }
        },
      }).$mount("#app");
    </script>
  </body>
</html>