执行下列选项的程序,输出结果不是undefined的是()
function fn(a,b){ console.log(b);}fn(1);
function fn(a,b){
console.log(b);
console.log(undefined + 1);
var arr = [];arr.length = 2;arr[0] = 1;console.log(arr[1]);
var arr = [];
arr.length = 2;
arr[0] = 1;
console.log(arr[1]);
function fun(){}console.log(fun());
function fun(){}
console.log(fun());
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