双等号 (==) 和三等号 (===) 之间的 JavaScript 性能差异 [英] JavaScript performance difference between double equals (==) and triple equals (===)

问题描述

在 JavaScript 中，使用双等号 (==) 与使用三等号 (====) 之间是否存在性能差异?

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

严格比较 (===) 总是会稍微快一点，但是 差异通常可以忽略不计.

Strict comparison (===) will always be slightly faster, but the difference is usually negligible.

如果您确定在比较中不需要类型强制，那么更喜欢 === 绝对是有意义的.它总是至少和 == 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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