VUE生命周期钩子

var app=new Vue({
 el:'#app',
 data:{
 a:2
 },
 beforeCreate:function(){
 console.log("实例创建之前");
 },
 created:function(){
 console.log("a is:"+this.a);
 console.log("实例创建之后");
 },
 beforeMount:function(){
 console.log("模板编译/挂载之前")
 },
 mounted:function(){
 console.log("模板编译/挂载之后")
 },
 beforeupdated:function(){
 console.log("实例更新之前")
 },
 updated:function(){
 console.log("实例更新之后")
 },
 beforeDestory:function(){
 console.log("组件销毁前调用")
 },
 destroyed:function(){
 console.log("组件销毁后调用")
 }
})