sueboy
EExcel 丞燕快速查詢2
EExcel 丞燕快速查詢2 https://sandk.ffbizs.com/
javascript How does the double exclamation (!!) work in javascript?
https://stackoverflow.com/questions/784929/what-is-the-not-not-operator-in-javascript
https://stackoverflow.com/questions/29312123/how-does-the-double-exclamation-work-in-javascript
value
!value
!!value
false
true
false
true
false
true
null
true
false
undefined
true
false
0
true
false
-0
true
false
1
false
true
-5
false
true
NaN
true
false
''
true
false
'hello'
true
false
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