常用JS函数

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/***javascript正则表达式检验***/

//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      (定义一个函数名为isBetween)
* PARAMETERS: val AS any value      (val是任意数字)
* lo AS Lower limit to check       (lo表示最小的数字)
* hi AS Higher limit to check       (hi表示最大的数字)
* CALLS: NOTHING
* RETURNS: TRUE if val is between lo and hi both inclusive, otherwise false.  (返回的结果:如果val是lo和hi之间的数则为真,否则为假)
**********************************************************************************/
function isBetween (val, lo, hi) {
if ((val < lo) || (val > hi)) { return(false); }
else { return(true); }
}

 

/*********************************************************************************
* FUNCTION: isDate checks a valid date     (函数作用日期格式验证,格式为XXXX-XX-XX)
* PARAMETERS: theStr AS String     (theStr为要验证的日期)
* CALLS: isBetween, isInt       (里面用到了上面定义的isBetween函数和系统自带的isInt 函数)
* RETURNS: TRUE if theStr is a valid date otherwise false.      (正确返回真,否刚返回假)
**********************************************************************************/
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    (日期格式验证,日期格式为XXXX/XX/XX)
* PARAMETERS: theStr AS String     (theStr为要验证的日期)
* CALLS: isBetween, isInt       (里面用到了上面定义的isBetween函数和系统自带的isInt 函数)
* RETURNS: TRUE if theStr is a valid date otherwise false.      (正确返回真,否刚返回假)
**********************************************************************************/
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!      (日期比较,哪个是最近的日期!日期格式为:XXXX-XX-XX)
* PARAMETERS: lessDate,moreDate AS String         (lessDate表示小日期,moreDate表示大日期)
* CALLS: isDate,isBetween      (用到的方法有上面定义好的isDate、isBetween函数)
* RETURNS: TRUE if lessDate<moreDate      (如果前面的日期小于后面的日期则为真,否则返回假)
*********************************************************************************/
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.substring(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   (验证 值是否为空)
* PARAMETER str AS String
**********************************************************************************/
function isEmpty (str) {
if ((str==null)||(str.length==0)) return true;
else return(false);
}

/*********************************************************************************
* FUNCTION: isInt     (验证 值是否为整数)
* 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: isEmail        (验证Email格式)
* PARAMETER: String (Email Address)
* RETURNS: TRUE if the String is a valid Email address
* FALSE if the passed string is not a valid Email Address
* EMAIL FORMAT: AnyName@EmailServer e.g;webmaster@hotmail.com
* @ sign can appear only once in the email address.
*********************************************************************************/
function isEmail (theStr) {
var atIndex = theStr.indexOf('@');
var dotIndex = theStr.indexOf('.', atIndex);
var flag = true;
theSub = theStr.substring(0, dotIndex+1)

if ((atIndex < 1)||(atIndex != theStr.lastIndexOf('@'))||(dotIndex < atIndex + 2)||(theStr.length <= theSub.length))
{ return(false); }
else { return(true); }
}

 

 

 

 


 

 

 

 

 

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