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watch的作用是什么 #532

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Rashomon511 opened this issue Jun 22, 2019 · 0 comments

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Rashomon511 commented Jun 22, 2019

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。

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