G：vue watch props change
https://stackoverflow.com/questions/44584292/vuejs-2-0-how-to-listen-for-props-changes
https://stackoverflow.com/questions/44584292/vuejs-2-0-how-to-listen-for-props-changes
数组监听变化
https://segmentfault.com/q/1010000008079455
对象监听变化
https://www.zhihu.com/question/39155535
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https://cn.vuejs.org/v2/api/#vm-watch
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