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[vue] 39.watch的作用是什么 #430

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qiilee opened this issue Oct 8, 2019 · 0 comments
Open

[vue] 39.watch的作用是什么 #430

qiilee opened this issue Oct 8, 2019 · 0 comments
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qiilee commented Oct 8, 2019

答案：watch 主要作用是监听某个数据值的变化。和计算属性相比除了没有缓存，作用是一样的。

借助 watch 还可以做一些特别的事情，例如监听页面路由，当页面跳转时，我们可以做相应的权限控制，拒绝没有权限的用户访问页面。
@qiilee qiilee added the VUE label Oct 8, 2019
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