varfun=functionfn(){return;alert(12);};console.log(fun());打印结果是() A: 弹出12 B: 程序报错 C: D: undefined
varfun=functionfn(){return;alert(12);};console.log(fun());打印结果是() A: 弹出12 B: 程序报错 C: D: undefined
varfun=functionfn(){return;alert(12);};console.log(fun());打印结果是() A: 弹出12 B: 程序报错 C: null D: undefined
varfun=functionfn(){return;alert(12);};console.log(fun());打印结果是() A: 弹出12 B: 程序报错 C: null D: undefined
varx=1; functionfn(n){ n=n+1 }; y=fn(x);y的值为() A: 2 B: 1 C: 3 D: undefined
varx=1; functionfn(n){ n=n+1 }; y=fn(x);y的值为() A: 2 B: 1 C: 3 D: undefined
阅读以下代码,执行fn(7)的返回值是( )。varx = 10;functionfn(myNum){ var x = 11returnx + myNum;} A: 18 B: 17 C: 10 D: NaN
阅读以下代码,执行fn(7)的返回值是( )。varx = 10;functionfn(myNum){ var x = 11returnx + myNum;} A: 18 B: 17 C: 10 D: NaN
1