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Created September 30, 2017 02:29
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Vue.js - watcher
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vuejs_watcher.md

Vue 通过 watch 选项提供一个更通用的方法，来响应数据的变化。当你想要在数据变化响应时，执行异步操作或开销较大的操作，这是很有用的。 除了 watch 选项之外，您还可以使用 vm.$watch API 命令。

Refer: https://cn.vuejs.org/v2/guide/computed.html#观察者

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