单项选择题
有如下程序var x;function x(){}console.log(x);x=1;console.log(x);以上输出结果为 ()
A.undefined function x(){}
B.1function x(){}
C.function x(){},1
D.undeinfed 1
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单项选择题
A.undefined function x(){}
B.1function x(){}
C.function x(){},1
D.undeinfed 1
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