应该实例： <html xmlns="http://www.w3.org/1999/xhtml" lang="gb2312"> <head> <title> 实例：验证手机号 </title> <meta http-equiv="content-type" content="text/html; charset=gb2312" /> String.prototype.Trim = function() { var m = this.match(/^\s*(\S+(\s+\S+)*)\s*$/); return (m == null) ? "" : m[1]; } String.prototype.isMobile = function() { return (/^(?:13\d|15[])-?\d{5}(\d{3}|\*{3})$/.test(this.Trim())); } function chkForm(oForm) { if (oForm.tel.value.isMobile()) { oForm.tel.value=oForm.tel.value.Trim(); return true; } else { alert("请输入正确的手机号码!"); } return false; } </ script> </head> <body> </body> </html> [Ctrl+A 全选 注:如需引入外部Js需刷新才能执行]