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JS 常用技巧
source link: https://juejin.im/post/5c611c73f265da2d8f47159b
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1. 类型强制转换1.1 string强制转换为数字可以用*1来转化为数字(实际上是调用.valueOf方法) 然后使用Number.isNaN来判断是否为NaN，或者使用 a !== a 来判断是否为NaN，因为 NaN !== NaN'32' * 1
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