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假值与真值 #12

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Qhappyman opened this issue Jun 16, 2019 · 0 comments
Open

假值与真值 #12

Qhappyman opened this issue Jun 16, 2019 · 0 comments

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@Qhappyman
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Qhappyman commented Jun 16, 2019 •
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js中的每个值都有固定的布尔值，在布尔值表达式中评估该值时，该值就会转化为固定的布尔值，如果布尔值为true，那么为真值，如果为false，那么为假值。

js中假值：

  • false
  • null
  • undefined
  • 0
  • NaN
  • ""
    也就是
Boolean(false)=false
Boolean(null)=false

其余几乎为真值，就这样
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@Qhappyman