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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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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