vue生命周期函数
Posted lwwtt
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vue中所有的钩子函数:
beforeCreate(创建前)
created(创建后)
beforeMount(载入前)
mounted(载入后)
beforeUpdate(更新前)
updated(更新后)
beforeDestroy(销毁前)
下面是完整代码,当然用到那个周期函数写哪个就好,不一定要全部写出来,写出来自己又不用那不就是闲着没事做吗?=。=
<!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>
destroyed(销毁后)
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