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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copy from:https://www.cnblogs.com/samsara-yx/p/11352432.html
