- beforeCreate created
- beforeMount mounted
- beforeUpdate updated
- beforeDestroy destroyed
- 父子组件执行生命周期：
- 父beforeCreate -> 父created -> 父beforeMount -> 子beforeCreate -> 子created -> 子beforeMount -> 子mounted -> 父mounted -> 父beforeUpdate -> 子beforeUpdate -> 子updated -> 父updated -> 父beforeDestroy -> 子beforeDestroy -> 子destroyed -> 父destroyed
