day--27--vue生命周期总结
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>生命周期总结</title>
<script type="text/javascript" src="../js/vue.js"></script>
</head>
<body>
<div id="root">
<!--
1、常用的生命周期钩子
mounted:发送ajax请求、启动定时器、绑定自定义事件、订阅消息【等初始化操作】
beforeDestory:清除定时器、解绑自定义事件、曲线订阅消息等【收尾工作】
2、销毁vm实例
销毁后vm开发工具看不到任何信息
销毁后自定义事件失效,但是原生DOM事件有效
一般不会在beforeDestory操作数据,因为操作了,也不会触发更新流程
-->
<h2 :style="{opacity}">欢迎学习vue</h2>
<button @click="opacity=1">透明度设置为1</button>
<button @click="stop">点击停止变化</button>
</div>
    <script type="text/javascript">
      new Vue({
        el: "#root",
        data: {
          opacity: 1,
        },
        methods: {
          stop() {
            //clearInterval(this.timer);
            this.$destroy();
          },
          add() {
            console.log("add");
            this.n++;
          },
          bye() {
            console.log("bye");
            this.$destroy();
            console.log("bye9999");
          },
        },
        beforeCreate() {
          console.log("beforeCreate");
          //debugger;
        },
        created() {
          console.log("created");
        },
        beforeMount() {
          console.log("beforeMount");
        },
        // vue 完成模板的解析 并把真实的dom 元素放到页面后(挂在完毕)调用mounted
        mounted() {
          this.timer = setInterval(() => {
            // console.log("mounted", this);
            this.opacity -= 0.01;
            if (this.opacity <= 0) this.opacity = 1;
          }, 16);
        },
        beforeUpdate() {
          console.log("beforeUpdate");
        },
        updated() {
          console.log("updated");
        },
        beforeDestroy() {
          console.log("beforeDestroy");
          clearInterval(this.timer);
        },
        destroyed() {
          console.log("destroyed");
        },
      });
    </script>
  </body>
</html>
                    
                
                
            
        
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