A.var aa; B.var bb = 3;cc = ’good’; C.var dd = ee = 100; D.var ff = 3,gg = 'he's good';
A、var a=0 , b=-0; B、var a=NaN , b=NaN; C、var a=null , b=undefined; D、var a=[] , b=false;
Javascript中, 以下代碼運(yùn)行后變量y的值是:() var x = [‘abcde’ , 123456]; var y = typeof typeof x[1];
A."function" B."object" C."number" D."string"