形参默认值为undefined
 实参多于形参,取前面的实参
Number+undefined = NaN
 undefined+undefined = NaN
 “test”+null = testnull
 “test”+undefined= undefined
js中函数参数问题
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2022-01-16
形参默认值为undefined
 实参多于形参,取前面的实参
Number+undefined = NaN
 undefined+undefined = NaN
 “test”+null = testnull
 “test”+undefined= undefined
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