Compilation of commonly used js string judgment methods_javascript skills

js tools-js common methods, js common judgment methods
SUMMARY:

Copy code The code is as follows:

function obj$(id) Get the object based on id
function val$(id) Get the value of the object based on id
function trim(str) Delete the left and right spaces
function ltrim( str) Delete the left space
function rtrim (str) Delete the right space
function isEmpty(str) Whether the string has a value
function equals(str1, str2) js determines whether two strings are equal
function equalsIgnoreCase(str1, str2) js determines whether two strings are equal ignoring case comparison
function isChinese(str) js determines whether it is Chinese
function isEmail(strEmail) js determines whether it is an email
function isImg (str) js determines whether it is a file in image format jpg|jpeg|swf|gif
function isInteger(str) js determines whether it is an integer
function isFloat js determines whether it is a floating point number
function isPost (str) js determines whether it is a postal code (1 to 6 digits
function isMobile(str) js determines whether it is a mobile phone number
function isPhone(str) js determines whether it is a phone number. It must include an area code and can include an extension number
function isQQ(str) js determines whether it is a legal QQ number
function isIP(str) js determines whether it is a legal IP
function isDate(str) js determines whether it is a date type (example: 2005-12-12 )
function isIdCardNo(idNumber) js determines whether it is a legal ID number
*/

function obj$(id)
{
return document.getElementById(id);
}


function val$(id)
{
var obj = document.getElementById(id);
if(obj !== null)
{
return obj.value;
}
return null;
}


function trim(str)
{
return str.replace(/ (^s*)|(s*$)/g, '');
}


function ltrim(str)
{
return str.replace(/^ s*/g,'');
}


function rtrim(str)
{
return str.replace(/s*$/,'');
}


function isEmpty(str)
{
if(str != null && str.length > 0)
{
return true;
}
return false;
}


function equals(str1, str2)
{
if(str1 == str2)
{
return true;
}
return false;
}


function equalsIgnoreCase(str1, str2)
{
if(str1.toUpperCase() == str2. toUpperCase())
{
return true;
}
return false;
}


function isChinese(str)
{
var str = str.replace(/(^s*)|(s*$)/g,'');
if (!(/^[u4E00-uFA29]*$/.test(str)
&& (!/^[uE7C7-uE7F3]*$/.test(str))))
{
return false;
}
return true;
}


function isEmail(str)
{
if(/^[w-] (.[w-] )*@[w-] (.[w-] ) $/.test(str ))
{
return true
}
return false;
}


function isImg(str)
{
var objReg = new RegExp("[.] (jpg|jpeg|swf|gif)$", "gi");
if(objReg.test(str))
{
return true;
}
return false;
}


function isInteger(str)
{
if(/^-?d $/.test(str))
{
return true;
}
return false;
}


function isFloat(str)
{
if(/^(-?d )( .d )?$/.test(str)
{
return true;
}
return false;
}


function isPost(str)
{
if(/^d{1,6}$/.test(str))
{
return true;
}
return false;
}


function isMobile(str)
{
if(/^1[35]d{9}/.test(str))
{
return true;
}
return false;
}


function isPhone(str)
{
if(/^(0[1-9]d{1,2} -)d{7,8}(-d{1,8})?/.test(str))
{
return true;
}
return false;
}


function isQQ(str){
if(/^d{5,9}$/.test(str))
{
return true;
}
return false;
}


function isIP(str){
var reg = /^(25[0-5]|2[0-4][0-9 ]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]).(25[0-5] |2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1- 9]|0).(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1 }[0-9]{1}|[1-9]|0).(25[0-5]|2[0-4][0-9]|[0-1]{1}[0- 9]{2}|[1-9]{1}[0-9]{1}|[0-9])$/;
if(.test(str))
{
return true;
}
return false;
}


function isDate(str)
{
var reg = /^((((1[6 -9]|[2-9]d)d{2})-(0?[13578]|1[02])-(0?[1-9]|[12]d|3[01])) |(((1[6-9]|[2-9]d)d{2})-(0?[13456789]|1[012])-(0?[1-9]|[12]d |30))|(((1[6-9]|[2-9]d)d{2})-0?2-(0?[1-9]|1d|2[0-8]) )|(((1[6-9]|[2-9]d)(0[48]|[2468][048]|[13579][26])|((16|[2468][048] |[3579][26])00))-0?2-29-))$/;
if(reg.test(str))
{
return true;
}
return false;
}


function isIdCardNo(idNumber)
{
var factorArr = new Array(7,9,10,5,8,4,2, 1,6,3,7,9,10,5,8,4,2,1);
var varArray = new Array();
var lngProduct = 0;
var intCheckDigit;
var idNumber.length = ;

if ((idNumber.length != 15) && (idNumber.length != 18))
{
return false;
}
for(i=0;i{
varArray[i] = idNumber.charAt(i);
if ((varArray[i] < '0' || varArray[i] > '9') && (i != 17))
{
return false;
}
else if (i < 17)
{
varArray[i] = varArray[i]*factorArr[i];
}
}
if (idNumber.length == 18)
{
var date8 = idNumber.substring(6,14);
if (checkDate(date8) == false)
{
return false;
}
for(i=0;i<17;i )
{
lngProduct = lngProduct varArray[i];
}
intCheckDigit = 12 - lngProduct % 11;
switch (intCheckDigit)
{
case 10:
intCheckDigit = 'X';
break;
case 11:
intCheckDigit = 0;
break;
case 12:
intCheckDigit = 1;
break;
}
if (varArray[17].toUpperCase() != intCheckDigit)
{
return false;
}
}
else
{
var date6 = idNumber.substring(6,12);
if (checkDate(date6) == false)
{
return false;
}
}
return true;
}