JS 常用校验函数

答案：//校验是否全由数字组成 
function isDigit(s) 
{ 
var patrn=/^[0-9]{1,20}$/; 
if (!patrn.exec(s)) return false 
return true 
} 
//校验登录名：只能输入5-20个以字母开头、可带数字、“_”、“.”的字串 
function isRegisterUserName(s) 
{ 
var patrn=/^[a-zA-Z]{1}([a-zA-Z0-9]|[._]){4,19}$/; 
if (!patrn.exec(s)) return false 
return true 
} 
//校验用户姓名：只能输入1-30个以字母开头的字串 
function isTrueName(s) 
{ 
var patrn=/^[a-zA-Z]{1,30}$/; 
if (!patrn.exec(s)) return false 
return true 
} 
//校验密码：只能输入6-20个字母、数字、下划线 
function isPasswd(s) 
{ 
var patrn=/^(\w){6,20}$/; 
if (!patrn.exec(s)) return false 
return true 
} 
//校验普通电话、传真号码：可以“+”开头，除数字外，可含有“-” 
function isTel(s) 
{ 
//var patrn=/^[+]{0,1}(\d){1,3}[ ]?([-]?(\d){1,12})+$/; 
var patrn=/^[+]{0,1}(\d){1,3}[ ]?([-]?((\d)|[ ]){1,12})+$/; 
if (!patrn.exec(s)) return false 
return true 
} 
//校验手机号码：必须以数字开头，除数字外，可含有“-” 
function isMobil(s) 
{ 
var patrn=/^[+]{0,1}(\d){1,3}[ ]?([-]?((\d)|[ ]){1,12})+$/; 
if (!patrn.exec(s)) return false 
return true 
} 
//校验邮政编码 
function isPostalCode(s) 
{ 
//var patrn=/^[a-zA-Z0-9]{3,12}$/; 
var patrn=/^[a-zA-Z0-9 ]{3,12}$/; 
if (!patrn.exec(s)) return false 
return true 
} 
//校验搜索关键字 
function isSearch(s) 
{ 
var patrn=/^[^`~!@#$%^&*()+=|\\\][\]\{\}:;\'\,.<>/?]{1}[^`~!@$%^&()+=|\\\][\]\{\}:;\'\,.<>?]{0,19}$/; 
if (!patrn.exec(s)) return false 
return true 
} 
function isIP(s) //by zergling 
{ 
var patrn=/^[0-9.]{1,20}$/; 
if (!patrn.exec(s)) return false 
return true 
} 
/********************************************************************************* 
* FUNCTION: isBetween 
* PARAMETERS: val AS any value 
* lo AS Lower limit to check 
* hi AS Higher limit to check 
* CALLS: NOTHING 
* RETURNS: TRUE if val is between lo and hi both inclusive, otherwise false. 
*************** 
******************************************************************/ 
function isBetween (val, lo, hi) { 
if ((val < lo) || (val > hi)) { return(false); } 
else { return(true); } 
} 
/********************************************************************************* 
* FUNCTION: isDate checks a valid date 
* PARAMETERS: theStr AS String 
* CALLS: isBetween, isInt 
* RETURNS: TRUE if theStr is a valid date otherwise false. 
**********************************************************************************/ 
function isDate (theStr) { 
var the1st = theStr.indexOf('-'); 
var the2nd = theStr.lastIndexOf('-'); 
if (the1st == the2nd) { return(false); } 
else { 
var y = theStr.substring(0,the1st); 
var m = theStr.substring(the1st+1,the2nd); 
var d = theStr.substring(the2nd+1,theStr.length); 
var maxDays = 31; 
if (isInt(m)==false || isInt(d)==false || isInt(y)==false) { 
return(false); } 
else if (y.length < 4) { return(false); } 
else if (!isBetween (m, 1, 12)) { return(false); } 
else if (m==4 || m==6 || m==9 || m==11) maxDays = 30; 
else if (m==2) { 
if (y % 4 > 0) maxDays = 28; 
else if (y % 100 == 0 && y % 400 > 0) maxDays = 28; 
else maxDays = 29; 
} 
if (isBetween(d, 1, maxDays) == false) { return(false); } 
else { return(true); } 
} 
} 
/********************************************************************************* 
* FUNCTION: isEuDate checks a valid date in British format 
* PARAMETERS: theStr AS String 
* CALLS: isBetween, isInt 
* RETURNS: TRUE if theStr is a valid date otherwise false. 
**********************************************************************************/ 
function isEuDate (theStr) { 
if (isBetween(theStr.length, 8, 10) == false) { return(false); } 
else { 
var the1st = theStr.indexOf('/'); 
var the2nd = theStr.lastIndexOf('/'); 
if (the1st == the2nd) { return(false); } 
else { 
var m = theStr.substring(the1st+1,the2nd); 
var d = theStr.substring(0,the1st); 
var y = theStr.substring(the2nd+1,theStr.length); 
var maxDays = 31; 
if (isInt(m)==false || isInt(d)==false || isInt(y)==false) { 
return(false); } 
else if (y.length < 4) { return(false); } 
else if (isBetween (m, 1, 12) == false) { return(false); } 
else if (m==4 || m==6 || m==9 || m==11) maxDays = 30; 
else if (m==2) { 
if (y % 4 > 0) maxDays = 28; 
else if (y % 100 == 0 && y % 400 > 0) maxDays = 28; 
else maxDays = 29; 
} 
if (isBetween(d, 1, maxDays) == false) { return(false); } 
else { return(true); } 
} 
} 
} 
/******************************************************************************** 
* FUNCTION: Compare Date! Which is the latest! 
* PARAMETERS: lessDate,moreDate AS String 
* CALLS: isDate,isBetween 
* RETURNS: TRUE if lessDate<moreDate 
*********************************************************************************/ 
function isComdate (lessDate , moreDate) 
{ 
if (!isDate(lessDate)) { return(false);} 
if (!isDate(moreDate)) { return(false);} 
var less1st = lessDate.indexOf('-'); 
var less2nd = lessDate.lastIndexOf('-'); 
var more1st = moreDate.indexOf('-'); 
var more2nd = moreDate.lastIndexOf('-'); 
var lessy = lessDate.substrin(0,less1st); 
var lessm = lessDate.substring(less1st+1,less2nd); 
var lessd = lessDate.substring(less2nd+1,lessDate.length); 
var morey = moreDate.substring(0,more1st); 
var morem = moreDate.substring(more1st+1,more2nd); 
var mored = moreDate.substring(more2nd+1,moreDate.length); 
var Date1 = new Date(lessy,lessm,lessd); 
var Date2 = new Date(morey,morem,mored); 
if (Date1>Date2) { return(false);} 
return(true); 
} 
/********************************************************************************* 
* FUNCTION isEmpty checks if the parameter is empty or null 
* PARAMETER str AS String 
**********************************************************************************/ 
function isEmpty (str) { 
if ((str==null)||(str.length==0)) return true; 
else return(false); 
} 
/********************************************************************************* 
* FUNCTION: isInt 
* PARAMETER: theStr AS String 
* RETURNS: TRUE if the passed parameter is an integer, otherwise FALSE 
* CALLS: isDigit 
**********************************************************************************/ 
function isInt (theStr) { 
var flag = true; 
if (isEmpty(theStr)) { flag=false; } 
else 
{ for (var i=0; i<theStr.length; i++) { 
if (isDigit(theStr.substring(i,i+1)) == false) { 
flag = false; break; 
} 
} 
} 
return(flag); 
} 
/********************************************************************************* 
* FUNCTION: isReal 
* PARAMETER: heStr AS String 
decLen AS Integer (how many digits after period) 
* RETURNS: TRUE if theStr is a float, otherwise FALSE 
* CALLS: isInt 
**********************************************************************************/ 
function isReal (theStr, decLen) { 
var dot1st = theStr.indexOf('.'); 
var dot2nd = theStr.lastIndexOf('.'); 
var K = true; 
if (isEmpty(theStr)) return false; 
if (dot1st == -1) { 
if (!isInt(theStr)) return(false); 
else return(true); 
} 
else if (dot1st != dot2nd) return (false); 
else if (dot1st==0) return (false); 
else { 
var intPart = theStr.substring(0, dot1st); 
var decPart = theStr.substring(dot2nd+1); 
if (decPart.length > decLen) return(false); 
else if (!isInt(intPart) || !isInt(decPart)) return (false); 
else if (isEmpty(decPart)) return (false); 
else return(true); 
} 
} 
/******

上一个：javascript 打印页面代码
下一个：javascript eval()用法