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网上看到的“12个非常有用的JavaScript技巧”
source link: https://juejin.im/post/5af55e6751882542682e43e7
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记录一下，自己以后可能用的到。原文:blog.jscrambler.com/12-extremel…网上看到的。1) 使用!!将变量转换成布尔类型有时，我们需要检查一些变量是否存在，或者它是否具有有效值，从而将它们的值视为true。对于做这样的检查，你可以使
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