<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>vue生命周期学习</title>
<script src="https://cdn.bootcss.com/vue/2.4.2/vue.js"></script>
</head>
<body>
<div id="app">
<input v-model="message"></input>
<h1>{{message1}}</h1>
</div>
</body>
<script>
var vm = new Vue({/*创建vue对象*/
el: '#app',/****挂载目标****/
data: {/****数据对象****/
message: 'Hello World!'
},
computed:{/****实现某一属性的实时计算****/
message1:function(){
return this.message.split("").reverse().join("");
}
},
watched:{/****检测某一属性值的变化****/
},
methods:{/****组件内部的方法****/
},
beforeCreate: function() {
console.group('------beforeCreate创建前状态------');
console.log("%c%s", "color:red", "el : " + this.$el); //undefined
console.log("%c%s", "color:red", "data : " + this.$data); //undefined
console.log("%c%s", "color:red", "message: " + this.message)//undefined
},
/**
* 1.在beforeCreate和created钩子之间，程序开始监控Data对象数据的变化及vue内部的初始化事件
*
* */
created: function() {
console.group('------created创建完毕状态------');
console.log("%c%s", "color:red", "el : " + this.$el); //undefined
console.log("%c%s", "color:red", "data : " + this.$data); //已被初始化
console.log("%c%s", "color:red", "message: " + this.message); //已被初始化
},
/**
* 2.在created和beforeMount之间，判断是否有el选项，若有则继续编译，无，则暂停生命周期；
* 然后程序会判断是否有templete参数选项，若有，则将其作为模板编译成render函数。若无，则将外部html作为模板编译（template优先级比外部html高）
*
* */
beforeMount: function() {
console.group('------beforeMount挂载前状态------');
console.log("%c%s", "color:red", "el : " + (this.$el)); //已被初始化
console.log(this.$el);
console.log("%c%s", "color:red", "data : " + this.$data); //已被初始化
console.log("%c%s", "color:red", "message: " + this.message); //已被初始化
},
/**
* 3.在beforeMount和mounted之间，程序将上一步编辑好的html内容替换el属性指向的dom对象或者选择权对应的html标签里面的内容
*
* */
mounted: function() {
console.group('------mounted 挂载结束状态------');
console.log("%c%s", "color:red", "el : " + this.$el); //已被初始化
console.log(this.$el);
console.log("%c%s", "color:red", "data : " + this.$data); //已被初始化
console.log("%c%s", "color:red", "message: " + this.message); //已被初始化
},
/**
* 4.mounted和beforeUpdate之间，程序实时监控数据变化
*
* */
beforeUpdate: function() {
console.group('beforeUpdate 更新前状态===============》');
console.log("%c%s", "color:red", "el : " + this.$el);
console.log(this.$el);
console.log("%c%s", "color:red", "data : " + this.$data);
console.log("%c%s", "color:red", "message: " + this.message);
},
/**
* 5.beforeUpdate和updated之间，实时更新dom
*
* */
updated: function() {
console.group('updated 更新完成状态===============》');
console.log("%c%s", "color:red", "el : " + this.$el);
console.log(this.$el);
console.log("%c%s", "color:red", "data : " + this.$data);
console.log("%c%s", "color:red", "message: " + this.message);
},
beforeDestroy: function() {
console.group('beforeDestroy 销毁前状态===============》');
console.log("%c%s", "color:red", "el : " + this.$el);
console.log(this.$el);
console.log("%c%s", "color:red", "data : " + this.$data);
console.log("%c%s", "color:red", "message: " + this.message);
},
/**
* 6.实例销毁
*
* */
destroyed: function() {
console.group('destroyed 销毁完成状态===============》');
console.log("%c%s", "color:red", "el : " + this.$el);
console.log(this.$el);
console.log("%c%s", "color:red", "data : " + this.$data);
console.log("%c%s", "color:red", "message: " + this.message)
}
})
</script>
</html>