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== 和 ===、以及 Object. is 的区别 #31

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Hongbusi opened this issue Jul 8, 2022 · 0 comments
Open

== 和 ===、以及 Object. is 的区别 #31

Hongbusi opened this issue Jul 8, 2022 · 0 comments
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JS javascript today 每日一题。

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@Hongbusi
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Hongbusi commented Jul 8, 2022 •
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在这里引用一下 MDN 里面的解释：

  • Object.is() 与 == 不同。== 运算符在判断相等前对两边的变量（如果它们不是同一类型）进行强制转换（这种行为将 "" == false 判断为 true），而 Object.is 不会强制转换两边的值。
  • Object.is() 与 === 也不相同。差别是它们对待有符号的零和 NaN 不同，例如，=== 运算符（也包括 == 运算符）将数字 -0 和 +0 视为相等，而将 Number.NaN 与 NaN 视为不相等。
@Hongbusi Hongbusi added today 每日一题。 JS javascript labels Jul 8, 2022
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