var app=new Vue({
    el:‘#app‘,
    data:{
        a:2
    },
    beforeCreate:function(){
        console.log("實例創建之前");
    },
    created:function(){
        console.log("a is:"+this.a);
        console.log("實例創建之後");
    },
    beforeMount:function(){
        console.log("模板編譯/掛載之前")
    },
    mounted:function(){
        console.log("模板編譯/掛載之後")
    },
    beforeupdated:function(){
        console.log("實例更新之前")
    },
    updated:function(){
        console.log("實例更新之後")
    },
    beforeDestory:function(){
        console.log("組件銷毀前調用")
    },
    destroyed:function(){
        console.log("組件銷毀後調用")
    }
 
})

VUE生命周期鉤子