double equals(==)和triple equals(===)之间的JavaScript性能差异 [英] JavaScript performance difference between double equals (==) and triple equals (===)
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问题描述
在JavaScript中,使用double equals( ==
)与使用triple equals( ===
)?
In JavaScript, is there a performance difference between using a double equals (==
) vs using a triple equals (===
)?
示例: if(foo == bar)
vs if(foo === bar)
推荐答案
=== )总是稍快一点,但差异通常可以忽略不计。
如果你知道你不知道如何确定你更喜欢 ===
在比较中需要类型强制。它总是至少与 ==
一样快。
It definitely makes sense to prefer ===
if you know for certain that you don't need type coercion in the comparison. It will always be at least as fast as ==
.
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