vue钩子函数

 
 
官方截图，及参数：
 
 
 
 
 
 
 

<!DOCTYPE html>
<html>
<head>
    <title></title>
    <script type="text/javascript" src="https://cdn.jsdelivr.net/vue/2.1.3/vue.js"></script>
</head>
<body>
 
<div id="app">
     <p>{{ message }}</p>
</div>
 
<script type="text/javascript">
     
 
  var app = new Vue({
      el: '#app',
      data: {
          message : "xuxiao is boy"
      },
       beforeCreate: function () {
                console.group('beforeCreate 创建前状态===============》');
               console.log( "el     : " + this.$el); //undefined
               console.log("data   : " + this.$data); //undefined
               console.log("message: " + this.message)
        },
        created: function () {
            console.group('created 创建完毕状态===============》');
            console.log("el     : " + this.$el); //undefined
               console.log("data   : " + this.$data); //已被初始化
               console.log("message: " + this.message); //已被初始化
        },
        beforeMount: function () {
            console.group('beforeMount 挂载前状态===============》');
            console.log("el     : " + (this.$el)); //已被初始化
            console.log(this.$el);
               console.log("data   : " + this.$data); //已被初始化
               console.log("message: " + this.message); //已被初始化
        },
        mounted: function () {
            console.group('mounted 挂载结束状态===============》');
            console.log("el     : " + this.$el); //已被初始化
            console.log(this.$el);   
               console.log("data   : " + this.$data); //已被初始化
               console.log("message: " + this.message); //已被初始化
        },
        beforeUpdate: function () {
            console.group('beforeUpdate 更新前状态===============》');
            console.log("el     : " + this.$el);
            console.log(this.$el);  
               console.log("data   : " + this.$data);
               console.log("message: " + this.message);
        },
        updated: function () {
            console.group('updated 更新完成状态===============》');
            console.log("el     : " + this.$el);
            console.log(this.$el);
               console.log("data   : " + this.$data);
               console.log("message: " + this.message);
        },
        beforeDestroy: function () {
            console.group('beforeDestroy 销毁前状态===============》');
            console.log("el     : " + this.$el);
            console.log(this.$el);   
               console.log("data   : " + this.$data);
               console.log("message: " + this.message);
        },
        destroyed: function () {
            console.group('destroyed 销毁完成状态===============》');
            console.log("el     : " + this.$el);
            console.log(this.$el);
               console.log("data   : " + this.$data);
               console.log("message: " + this.message)
        }
    })
</script>
</body>
</html>
 
 
 
 
附带测试地址：http://jsrun.net/6YXKp/edit
 
根据控制台打印了解各个钩子函数调用顺序以及使用方法：
 
 
 
 
 
 
posted @ 2020-06-01 22:08 Java·小白阅读(99) 评论(0) 收藏举报
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