以下代码执行后,array的结果是?() let array=[,1,,2,,3]; array=array.map((i)=>++i)
A.[,2,,3,,4] B.[NaN,2,NaN,3,NaN,4] C.[1,2,1,3,1,4] D.[null,2,null,3,null,4]
A.e.next() B.e.nextElement() C.e.nextElementSibling D.e.nextSibling
A.var test=1;typeof test==’number’; B.var test=1.2;typeof test==’float’; C.var test=undefined;typeof test==’undefined’; D.var test={};typeof test==’object’;