Some common JavaScript form validation code

The code is as follows

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Verify Email function checkemail (mail) { if (mail.length > 0 && mail.length < 101) { var regex =/^[_.0-9a-za-z+-]+@ ([0-9a-za-z]+[0-9a-za-z-]*.) +[a-za-z]{2,4}$/; if (regex.exec (mail)) { return true; } } return false; } Verify ZIP Code function Checkzip (Zip) { var regex =/^[0-9]{6}$/; if (regex.exec (Zip)) { return true; } return false; } Verify ID function Checkidcard (idcard) { var regex =/^[0-9xx]{15,18}$/; if (Regex.exec (Idcard)) { return true; } return false; } Verify fixed function Checktel (tel) { var regex =/^[0-9]{3,4}-[0-9]{7,8}$/; if (regex.exec (tel)) { return true; } return false; } Verify the phone function Checkmobile (MOBILE) { var regex =/^[0-9]{11}$/; if (Regex.exec (mobile)) { return true; } return false; } Verify QQ function Checkqq (QQ) { QQ = $.trim (QQ); if (qq.length > 0 && qq.length < 101) { var regex =/^[0-9]{1,12}$/; if (Regex.exec (QQ)) { return true; } else { Return Checkemail (QQ); } } return false; } Verification name Chinese, English or digital function Checkuname (name) { var regex =/^[a-za-z0-9u4e00-u9fa5]{2,10}$/; if (regex.exec (name)) { return true; } return false; } function Checkuname (name,start,end) { var regex = new RegExp ("^[a-za-z0-9\u4e00-\u9fa5]{" +start+ "," +end+ "}$"); if (regex.exec (name)) { return true; } return false; } Verify URL function Checksiteurl (URL) { var regex =/^http://([a-za-z0-9] ([a-za-z0-9-]{0,61}[a-za-z0-9])? +[a-za-z]{2,6} (: [0-9]{1,5})? $/; if (regex.exec (URL)) { if (Url.length < 201) { var istrue = false; $.ajax ({ Type: "Post", URL: "Register.aspx", DataType: "HTML", Async:false, Data: "Url=" + Escape (URL) + "&t=checkurl", Cache:false, Success:function (data) { if (data = = "Can") { IsTrue = true; } } }); if (istrue) { return true; } } } return false; }