Comments (7)
谢谢指出,这个判断确实是多余的。我把它删掉。
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并不一定吧~ isMounted是在回调函数中,并且涉及网络请求,没人能保证它执行的时候仍旧是Mounted的
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@vipcxj componentDidMount
是在isMounted
状态为true
的时候执行的回调函数,所以是可以保证的。我刚才仔细看了一下README
的实例是正确的,有误的只是demo11
文件夹里面的那个实例代码。而且这个东西不好
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@Nbsaw 没记错的话,应该是执行get网络请求后才调用的回调函数,如果网比较差,这就会有一个时间差了啊,如果期间被unmount了,也是可能的
from react-demos.
理论上,获取到数据的时候,组件是可能被卸载的。但是,这个例子里,确实是多余的判断。
另外,isMounted
这个 API 也已经被废掉了,所以还是去掉比较好。facebook/react#5465
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@ruanyf 我把整个issure都看了下,基本就是react的开发者嫌isMounted不够优雅,想废除它,但又没在react内部给一个完美的代替方案,所以另一个react的贡献者就不同意了。然后就是提出各种workaround,然而所有workaround都不是react自带的,全部仅仅是workaround~ 没看到这个issure的岂不是要被坑?
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isMounted 确实被废掉了。https://github.com/facebook/react/blob/3c977dea6b96f6a9bb39f09886848da870748441/packages/react/src/ReactBaseClasses.js#L89
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