Vue 学习05——Vue生命周期

Vue生命周期

生命周期示意图 - Vue life

生命周期钩子 - Vue life stage

Vue生命周期
生命周期示意图 - Vue life

前言：VUE实例在整个生命周期中自动挂在了很多的生命周期钩子（回调函数），在这些回调函数中可以访问VUE的属性方法来完成操作。生命周期示意图

生命周期钩子 - Vue life stage
生命周期钩子

生命钩子 demo

<!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 : "hello vue,this is life" 
      },
       beforeCreate: function () {
                console.group('beforeCreate 创建前状态===============》');
               console.log("%c%s", "color:blue" , "el     : " + this.$el); //undefined
               console.log("%c%s", "color:blue","data   : " + this.$data); //undefined 
               console.log("%c%s", "color:blue","message: " + this.message)  
        },
        created: function () {
            console.group('created 创建完毕状态===============》');
            console.log("%c%s", "color:blue","el     : " + this.$el); //undefined
               console.log("%c%s", "color:blue","data   : " + this.$data); //已被初始化 
               console.log("%c%s", "color:blue","message: " + this.message); //已被初始化
        },
        beforeMount: function () {
            console.group('beforeMount 挂载前状态===============》');
            console.log("%c%s", "color:blue","el     : " + (this.$el)); //已被初始化
            console.log(this.$el);
               console.log("%c%s", "color:blue","data   : " + this.$data); //已被初始化  
               console.log("%c%s", "color:blue","message: " + this.message); //已被初始化  
        },
        mounted: function () {
            console.group('mounted 挂载结束状态===============》');
            console.log("%c%s", "color:blue","el     : " + this.$el); //已被初始化
            console.log(this.$el);    
               console.log("%c%s", "color:blue","data   : " + this.$data); //已被初始化
               console.log("%c%s", "color:blue","message: " + this.message); //已被初始化 
        },
        beforeUpdate: function () {
            console.group('beforeUpdate 更新前状态===============》');
            console.log("%c%s", "color:blue","el     : " + this.$el);
            console.log(this.$el);   
               console.log("%c%s", "color:blue","data   : " + this.$data); 
               console.log("%c%s", "color:blue","message: " + this.message); 
        },
        updated: function () {
            console.group('updated 更新完成状态===============》');
            console.log("%c%s", "color:blue","el     : " + this.$el);
            console.log(this.$el); 
               console.log("%c%s", "color:blue","data   : " + this.$data); 
               console.log("%c%s", "color:blue","message: " + this.message); 
        },
        beforeDestroy: function () {
            console.group('beforeDestroy 销毁前状态===============》');
            console.log("%c%s", "color:blue","el     : " + this.$el);
            console.log(this.$el);    
               console.log("%c%s", "color:blue","data   : " + this.$data); 
               console.log("%c%s", "color:blue","message: " + this.message); 
        },
        destroyed: function () {
            console.group('destroyed 销毁完成状态===============》');
            console.log("%c%s", "color:blue","el     : " + this.$el);
            console.log(this.$el);  
               console.log("%c%s", "color:blue","data   : " + this.$data); 
               console.log("%c%s", "color:blue","message: " + this.message)
        }
    })
</script>
</body>
</html>