1.加載渲染過程
父beforeCreate->父created->父beforeMount->子beforeCreate->子created->子beforeMount->子mounted->父mounted
2.子組件更新過程
父beforeUpdate->子beforeUpdate->子updated->父updated
3.父組件更新過程
父beforeUpdate->父updated
4.銷燬過程
父beforeDestroy->子beforeDestroy->子destroyed->父destroyed