JS logical operator

Catalog

How to use logical operators

1.！ Not

2.&& And

3.|| or

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How to use logical operators

1.！ Not

！ Not    

01. Reverse operation , Negate Boolean values      ！true=false     !false=true

02. Negate non Boolean values , First turn Boolean value and then negate

03. Negate a value twice , The value remains the same , Is a hidden Boolean conversion

2.&& And

&& And

01. A false full holiday

02. Leave first and then don't watch , The first is false , The latter will not recognize , The result is directly false

3.|| or

|| or

01. True truth

02. Be true before you look , The first is true , The latter will not recognize , The result is directly true