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@@ -0,0 +1,48 @@
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+<!DOCTYPE html>
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+<html lang="en">
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+<head>
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+ <meta charset="UTF-8">
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+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
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+ <title>Document</title>
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+</head>
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+<body>
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+ <!--
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+ 需求：
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+ 进入页面，输入月份，判断是几月并弹出该月的实际天数
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+ -->
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+ <script>
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+ // alert("111"); // 警告框
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+ // confirm("真的么"); // 确认框
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+ // prompt("请输入您的用户名","Lucy") // 提示框
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+ // prompt("提示的信息","默认填入信息")
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+ // console.log("显示内容")
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+ // var mouth = 13;
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+ // prompt("请输入月份");
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+ var mouth = prompt("请输入月份");
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+ console.log(mouth)
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+ switch(mouth) {
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+ case "1":
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+ case "3":
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+ case "5":
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+ case "7":
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+ case "8":
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+ case "10":
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+ case "12":
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+ alert("当前是"+mouth+"月,天数是31天");
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+ break;
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+ case "2":
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+ alert("当前是"+mouth+"月,天数是28天");
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+ break;
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+ case "4":
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+ case "6":
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+ case "9":
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+ case "11":
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+ alert("当前是"+mouth+"月,天数是30天");
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+ break;
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+ default:
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+ alert("当前输入的值是非法数字");
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+ break;
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+ }
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+ </script>
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+</body>
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+</html>
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