用JavaScript写一个判断一个输入的数是偶数还是奇数的代码？

Question

怎么写啊？？快点

Answer 1

<script type="text/JavaScript">
var num = prompt("请输入一个数字","");
function fun(num){
var a = parseInt(num);
switch(a%2){
case 0:
document.write("是偶数");
break;
case 1:
document.write("是奇数");
break;
default:
alert("不是数字，请重新输入");
var num = prompt("请输入一个数字","");
fun(num);
break;
}
}
fun(num);
</script>

Answer 2

天啊

Answer 3

function checkIt(srcdata)
{
alert(srcdata%2==0?"偶数":"奇数");
}