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为什么要在watcher.run再检查一次value!==watcher.value？ #66

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lsycxyj opened this issue Oct 14, 2019 · 0 comments
Open

为什么要在watcher.run再检查一次value!==watcher.value？ #66

lsycxyj opened this issue Oct 14, 2019 · 0 comments

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@lsycxyj
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lsycxyj commented Oct 14, 2019

你好，我阅读vue的源码，发觉在setter已经做了次差值比较，watcher也经过了去重处理，然后却又再watcher.run做了一次新旧值比较（只比对primitive类型），才决定是否执行cb回调。那这个比较会在什么情景下会有用？还是其实基本是多余的？
麻烦指点一下，谢谢
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