JS while 循环

作者: coolkid_carryon | 来源:发表于2018-09-19 11:29 被阅读0次

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>while练习1</title>
        <script type="text/javascript">
            /*
             假如投资年利率为5%，试求从1000块增长到5000块，需要话费多少年
             */
            var money = 1000;
            var year = 0;
            while (money<5000){
                money*=1.05;
                year++;
            }
            alert(year);
        </script>
    <body>
    </body>
</html>

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>while练习2</title>
        <script type="text/javascript">
            /*
             while循环重写小明的成绩，如果用户输入不合法就反复输入，直到正确为止
             */
            while (true){
                var score = prompt('请输入小明的成绩');
                if (!+score || (+score*10%5 != 0) || +score>100 || +score<0) {
                    alert('非法输入');
                }else {
                    break;
                }
            }
        </script>
    <body>
    </body>
</html>