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Vue 生命周期

Snipaste_20200528_000222.jpg lifecycle.png

        
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<!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.bootcdn.net/ajax/libs/vue/2.6.11/vue.min.js"></script> </head> <body> <div> <h1>{{message + '这是在outer HTML中的'}}</h1> </div> </body> <script> var vm = new Vue({ //el: '#app', template: "<h1>{{message +'这是在template中的'}}</h1>", //在vue配置项中修改的 data: { message: 'Vue的生命周期' }, 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) }, 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 }, 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.$data); //已被初始化 console.log("%c%s", "color:red","message: " + this.message); //已被初始化 console.log(document.querySelector("h1").textContent); }, mounted: function() { console.group('------mounted 挂载结束状态------'); console.log("%c%s", "color:red","el : " + this.$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 console.log(document.querySelector("h1").textContent); }, 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.$data); console.log("%c%s", "color:red","message: " + this.message); console.log(document.querySelector("h1").textContent); }, updated: function () { console.group('updated 更新完成状态===============》'); console.log("%c%s", "color:red","el : " + this.$el); console.log(this.$el); console.log("%c%s", "color:red","data : " + this.$data); console.log("%c%s", "color:red","message: " + this.message); console.log(document.querySelector("h1").textContent); }, 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.$data); console.log("%c%s", "color:red","message: " + this.message); }, destroyed: function () { console.group('destroyed 销毁完成状态===============》'); console.log("%c%s", "color:red","el : " + this.$el); console.log(this.$el); console.log("%c%s", "color:red","data : " + this.$data); console.log("%c%s", "color:red","message: " + this.message) } }) setTimeout( ()=>{vm.$mount("#app")},3000) </script> </html>

三秒前 Snipaste_20200527_234601.jpg

三秒后

Snipaste_20200527_234644.jpg

说明了不指定"el"会卡在create那里

Snipaste_20200527_234819.jpg

template注释掉之后就会显示外面的Html

Snipaste_20200527_235117.jpg

代码参考: https://segmentfault.com/a/1190000011381906

——THE END——

Article at   2020/05/28 00:05  Published  code  Category,viewed  198  times

Relevant tags:    Vue 

Address:   https://www.kedong.me/article/18

Copyright Notice: Freely reproduced for non-commercial use