vue的生命周期定义
vue每个组件都是独立的，每个组件都有一个属于它的生命周期，从一个组件创建、数据初始化、挂载、更新、销毁，这就是一个组件所谓的生命周期。在组件中具体的方法有:
beforeCreate
created
beforeMount
mounted
(
beforeUpdate
updated
)
beforeDestroy
destroyed
<!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>shengmingzhouqi 实例</title>
<script type="text/javascript" src="../assets/js/vue.js"></script>
</head>
<body>
<h1>生命周期</h1>
<hr>
<div id="app">
{{count}}
<p><button @click="add">add</button></p>
</div>
<button onclick="app.$destroy()">销毁</button>
<script type="text/javascript">
var app=new Vue({
el:'#app',
data:{
count:1
},
methods:{
add:function(){
this.count++;
}
},
beforeCreate:function(){
console.log('1-beforeCreate 初始化之后');
},
created:function(){
console.log('2-created 创建完成');
},
beforeMount:function(){
console.log('3-beforeMount 挂载之前');
},
mounted:function(){
console.log('4-mounted 被创建(被挂载之后)');
},
beforeUpdate:function(){
console.log('5-beforeUpdate 数据更新前');
},
updated:function(){
console.log('6-updated 被更新后');
},
activated:function(){
console.log('7-activated');
},
deactivated:function(){
console.log('8-deactivated');
},
beforeDestroy:function(){
console.log('9-beforeDestroy 销毁之前');
},
destroyed:function(){
console.log('10-destroyed 销毁之后')
}
})
</script>
</body>
</html>
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