1. 加载渲染过程

父beforeCreate->父created->父beforeMount->子beforeCreate->子created->子beforeMount->子mounted->父mounted

2. 子组件更新过程

父beforeUpdate->子beforeUpdate->子updated->父updated

3. 父组件更新过程

父beforeUpdate->父updated

4. 销毁过程

父beforeDestroy->子beforeDestroy->子destroyed->父destroyed

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