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JS console alert repl error variable variable declaration promotion data type typeof
2022-07-22 12:45:00 【HandsomeDanielWu】
JS It's a weakly typed programming language , What type of assignment , What kind of
alert
console
Report errors 
syntax grammar
REPL.evaluate
Variable
Variable declaration promotion
data type 
typeof 
typeof It's the operator , It's not a function 
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