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- <!DOCTYPE html>
- <html lang="en">
- <head>
- <meta charset="UTF-8">
- <meta name="viewport" content="width=device-width, initial-scale=1.0">
- <title>Document</title>
- </head>
- <body>
- <script>
- // alert("内容")//警告框
- // prompt("请输入")//提示框
- // confirm("好的") //确认框
- // window.prompt("请输入年级",18)
- // prompt（"提示信息"，默认输入框中的值）
- var month = prompt("请输入月份");
- var a = 3; //number
- var b = '3'; //string
- console.log(month,'mouth')
- console.log(a,'a')
- console.log(b,'b')
- switch(month) {
- case "1":
- case "3":
- case "5":
- case "7":
- case "8":
- case "10":
- case "12":
- alert("当前是31天");
- break;
- case "4":
- case "6":
- case "9":
- case "11":
- alert("当前是30天");
- break;
- case "2":
- alert("当前是2月");
- break;
- default:
- alert("输入内容不是数字");
- break;
- }
- </script>
- </body>
- </html>
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