【Web】JavaScript（No.43）分支结构-switch语句案例（一）根据月份显示对应的天数

本文链接：https://blog.youkuaiyun.com/qq_43251850/article/details/94618469

需求：用户输入月份，输入对应的天数。

话不多说，直接上代码：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>根据月份显示对应的天数</title>
</head>
<body>
<script>
    var month = Number(prompt("请输入月份:"));
    console.log(month);
    switch(month){
        case 1:
            console.log(month+"月有31天");
            break;
        case 2:
            console.log(month+"月有28天");
            break;
        case 3:
            console.log(month+"月有31天");
            break;
        case 4:
            console.log(month+"月有30天");
            break;
        case 5:
            console.log(month+"月有31天");
            break;
        case 6:
            console.log(month+"月有30天");
            break;
        case 7:
            console.log(month+"月有31天");
            break;
        case 8:
            console.log(month+"月有31天");
            break;
        case 9:
            console.log(month+"月有30天");
            break;
        case 10:
            console.log(month+"月有31天");
            break;
        case 11:
            console.log(month+"月有30天");
            break;
        case 12:
            console.log(month+"月有31天");
            break;
        default:
            console.log("月份输入错误！请刷新重新输入！");
    }
</script>
</body>
</html>

简写：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>02.根据月份显示对应的天数</title>
</head>
<body>
<script>
    var month = Number(prompt("请输入月份"));
    console.log(month);
    switch(month){
        case 1:
        case 3:
        case 5:
        case 7:
        case 8:
        case 10:
        case 12:
            console.log(month+"月有31天");
            break;
        case 2:
            console.log(month+"月有28天");
            break;
        case 4:
        case 6:
        case 9:
        case 11:
            console.log(month+"月有30天");
            break;
        default:
            console.log("月份输入错误！请刷新重新输入！");
    }
</script>
</body>
</html>