一、加载渲染过程 父beforeCreate->父created->父beforeMount->子beforeCreate->子created->子beforeMount->子mounted->父mounted 二、子组件更新过程 父beforeUpdate->子beforeUpdate->子updated->父updated 三、父组件更新过程 父beforeUpdate->父updated 四、销毁过程 父beforeDestroy->子beforeDestroy->子destroyed->父destroyed