fmpq.com
源代码：
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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Fmpq教程(fmpq.com)</title> </head> <body> <form action="tryjs_submitpage.htm" onsubmit="return myFunction()"> 姓名 (最大 10 个字符): <input type="text" id="fname" size="20"><br> 年龄 (从 1 到 100): <input type="text" id="age" size="20"><br> E-mail: <input type="text" id="email" size="20"><br> <br> <input type="submit" value="提交"> </form> <script> function myFunction() { var at = document.getElementById("email").value.indexOf("@"); var age = document.getElementById("age").value; var fname = document.getElementById("fname").value; submitOK = "true"; if (fname.length>10) { alert("姓名不能超过 10 个字符"); submitOK = "false"; } if (isNaN(age)||age<1||age>100) { alert("年龄范围为 1 到 100"); submitOK = "false"; } if (at==-1) { alert("不合法的 e-mail!"); submitOK = "false"; } if (submitOK=="false") { return false; } } </script> </body> </html>
运行结果