一、Vue生命周期
Vue生命周期的八个阶段
创建前 beforeCreate
创建后 created
载入前 beforeMount
载入后 mounted
更新前 beforeUpdate
更新后 updated
销毁前 beforeDestroy
销毁后 destroyed
Vue生命周期的八个阶段如下图：
二、生命周期示例
生命周期示例代码：
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>生命周期</title> <script src="vue/vue.js"></script> </head> <body> <div id="app"> {{message}} </div> </body> <script> let vm = new Vue({ el: '#app', 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);//undefined }, 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===============》'); let dom = document.getElementById("app").innerHTML; console.log(dom); console.log("%c%s", "color:red", "el : " + this.$el); console.log(this.$el); console.log("%c%s", "color:red", "data : " + this.$data); console.log("%c%s", "color:red", "message: " + this.message); }, updated: function() { console.group('updated 更新完成状态===============》'); let dom = document.getElementById("app").innerHTML; console.log(dom); console.log("%c%s", "color:red", "el : " + this.$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); } }); //vm.$destroy(); 方法 </script> </html>
运行结果如下图：
