前言
在使用vue一个多礼拜后，感觉现在还停留在初级阶段，虽然知道怎么和后端做数据交互，但是对于mounted这个挂载还不是很清楚的。放大之，对vue的生命周期不甚了解。只知道简单的使用，而不知道为什么，这对后面的踩坑是相当不利的。
因为我们有时候会在几个钩子函数里做一些事情，什么时候做，在哪个函数里做，我们不清楚。
于是我开始先去搜索，发现vue2.0的生命周期没啥文章。大多是1.0的版本介绍。最后还是找到一篇不错的（会放在最后）
vue生命周期简介
咱们从上图可以很明显的看出现在vue2.0都包括了哪些生命周期的函数了。
生命周期探究
对于执行顺序和什么时候执行，看上面两个图基本有个了解了。下面我们将结合代码去看看钩子函数的执行。
ps:下面代码可以直接复制出去执行
<!DOCTYPE html> <html> <head> <title></title> <script type="text/javascript" src="https://cdn.jsdelivr.net/vue/2.1.3/vue.js"></script> </head> <body> <div id="app"> <p>{{ message }}</p> </div> <script type="text/javascript"> var app = new Vue({ el: '#app', data: { message : "xuxiao is boy" }, 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.$data); //已被初始化 console.log("%c%s", "color:red","message: " + this.message); //已被初始化 }, mounted: function () { console.group('mounted 挂载结束状态===============》'); console.log("%c%s", "color:red","el : " + this.$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 }, 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.$data); console.log("%c%s", "color:red","message: " + this.message); }, updated: function () { console.group('updated 更新完成状态===============》'); console.log("%c%s", "color:red","el : " + this.$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.$data); console.log("%c%s", "color:red","message: " + this.message); }, destroyed: function () { console.group('destroyed 销毁完成状态===============》'); console.log("%c%s", "color:red","el : " + this.$el); console.log(this.$el); console.log("%c%s", "color:red","data : " + this.$data); console.log("%c%s", "color:red","message: " + this.message) } }) </script> </