多选题vara=1；functiontest（）{a++；alert（a）；vara=1；alert（a）；}test（）；分析上面JavaScript代码段，输出结果错误的是（）。ANaN1B1NaNC11DNaNNaN
多选题
vara=1；functiontest（）{a++；alert（a）；vara=1；alert（a）；}test（）；分析上面JavaScript代码段，输出结果错误的是（）。
A
NaN1
B
1NaN
C
11
D
NaNNaN
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