(精华)2020年8月26日 vue vue组件生命周期
【摘要】
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta n...
<!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">
<h1>{{message}}</h1>
<button @click="update">更新数据</button>
<button @click="destroy">销毁组件</button>
</div>
</body>
<script>
var vm = new Vue({
el: '#app',
data: {
message: 'Vue的生命周期'
},
methods: {
update() {
this.message = '我改变了数据'
},
destroy() {
this.$destroy(); //组件被销毁以后, 再次对组件进行任何操作都 不起作用了
// vm.$destroy();
}
},
beforeCreate: function () {
console.group('------beforeCreate 创建前状态:组件实例刚刚创建,还未进行数据观测和事件配置------');
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
},
created: function () {
console.group('------created 创建完毕状态:实例已经创建完成,并且已经进行数据观测和事件配置------');
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
},
beforeMount: function () {
console.group('------beforeMount挂载前状态:模板编译之前,还没挂载------');
console.log("%c%s", "color:red", "el : " + (this.$el)); //已被初始化
console.log(this.$el); //模板没有渲染
console.log("%c%s", "color:red", "data : " + this.$data); //已被初始化
console.log("%c%s", "color:red", "message: " + this.message); //已被初始化
},
mounted: function () {
console.group('------mounted 挂载结束状态:模板编译之后,已经挂载,此时才会渲染页面,才能看到页面上数据的展示------');
console.log("%c%s", "color:red", "el : " + this.$el); //已被初始化
console.log(this.$el); //模板已经渲染
console.log("%c%s", "color:red", "data : " + this.$data); //已被初始化
console.log("%c%s", "color:red", "message: " + this.message); //已被初始化
},
beforeUpdate: function () {
console.group('beforeUpdate 更新前状态:组件更新之前===============》');
console.log("%c%s", "color:red", "el : " + this.$el);
console.log(this.$el); //还是原来的数据,新数据还没渲染
console.log("%c%s", "color:red", "data : " + this.$data);
console.log("%c%s", "color:red", "message: " + this.message);
},
updated: function () {
console.group('updated 更新完成状态:组件更新之后===============》');
console.log("%c%s", "color:red", "el : " + this.$el);
console.log(this.$el); //新数据已经渲染完成
console.log("%c%s", "color:red", "data : " + this.$data);
console.log("%c%s", "color:red", "message: " + this.message);
},
beforeDestroy: function () {
console.group('beforeDestroy 销毁前状态 :组件销毁之前===============》');
console.log("%c%s", "color:red", "el : " + this.$el);
console.log(this.$el);
console.log("%c%s", "color:red", "data : " + this.$data);
console.log("%c%s", "color:red", "message: " + this.message);
},
destroyed: function () {
console.group('destroyed 销毁完成状态:组件销毁之后===============》');
console.log("%c%s", "color:red", "el : " + this.$el);
console.log(this.$el);
console.log("%c%s", "color:red", "data : " + this.$data);
console.log("%c%s", "color:red", "message: " + this.message)
},
activated() {
console.log('我这个页面显示就会执行');
},
deactivated: function () {
console.log('我这个页面退出的会执行');
},
})
</script>
</html>
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文章来源: codeboy.blog.csdn.net,作者:愚公搬代码,版权归原作者所有,如需转载,请联系作者。
原文链接:codeboy.blog.csdn.net/article/details/107303330
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