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87.判断一个数是否是偶数.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<script>
    var num=prompt("请输入一个数字");
    function checkNum(num) {
        if (num%2==0){
            document.write(num+" is 偶数。")
        }else{
            document.write(num+" is 奇数。")
        }
    }
    //checkNum(num);
    function mianji(r) {
        var result=3.14*r*r;
        return result
    }
    var a=mianji(num);
    alert(a);
</script>
</body>
</html>