Frequently Used javascript verification function collection _ javascript skills

We recommend that you collect the javascript verification functions that are frequently used. You can use them directly in the future.
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Whether it is null. Only the null string or the length of 0 is null. After trim IsStringNull (string)

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*/

function IsStringNull(str) {     if (str == null)         return true;     var trimStr = Trim(str);     if (trimStr.length == 0)         return true;     return false; }

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LTrim (string): removes spaces on the left.

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*/

function LTrim(str) {     var whitespace = new String(" \t\n\r");     var s = new String(str);     if (whitespace.indexOf(s.charAt(0)) != -1) {         var j = 0, i = s.length;         while (j < i && whitespace.indexOf(s.charAt(j)) != -1) {             j++;         }         s = s.substring(j, i);     }     return s; }

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RTrim (string): removes spaces on the right.

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*/ function RTrim(str) {     var whitespace = new String(" \t\n\r");     var s = new String(str);     if (whitespace.indexOf(s.charAt(s.length - 1)) != -1) {         var i = s.length - 1;         while (i >= 0 && whitespace.indexOf(s.charAt(i)) != -1) {             i--;         }         s = s.substring(0, i + 1);     }     return s; } /*

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Trim (string): removes leading and trailing spaces.

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*/ function Trim(str) {     return RTrim(LTrim(str)); } /*

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IsOutOfLength (string, int): determines whether the length of a string exceeds the length. The Chinese character contains 2 characters.

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*/ function IsOutOfLength(str, len) {     var strLength = 0;     for (var i = 0; i < str.length; i++) {         if (str.charCodeAt(i) > 256) {             strLength++;         }         strLength++;         if (strLength > len) {             return true;         }     }     return false; } /*

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IsOutOfLength (string, int): determines whether the length of a string exceeds the length. The Chinese character contains three characters.

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*/ function IsOutOfLength3(str, len) {     var cArr = str.match(/[^\x00-\xff]/ig);     var len_address = str.length + (cArr == null ? 0 : cArr.length * 2);     if (len_address > len)         return true;     else         return false; } /*

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IsNumeric (string): determines whether the string is a number.

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*/ function IsNumeric(strNumber) {     if (strNumber.length == 0) {         return false;     }     return (strNumber.search(/^(-|\+)?\d+(\.\d+)?$/) != -1); } /*

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IsInt (string, string, int or string) :( test string, + or-or empty, empty or 0) function: judge whether it is an integer, positive integer, negative integer, positive integer + 0, negative integer + 0

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*/Function IsInt (objStr, sign, zero) {var reg; var bolzero; if (Trim (objStr) = "") {return false;} else {objStr = objStr. toString () ;}if (sign = null) | (Trim (sign) = "") {sign = "+ -";} if (zero = null) | (Trim (zero) = "") {bolzero = false;} else {zero = zero. toString (); if (zero = "0") {bolzero = true;} else {alert ("check whether the parameter 0 is included, can only be (null, 0) ") ;}} switch (sign) {case" none ": I F (! Bolzero) {reg =/^ [0-9] * [1-9] [0-9] * $ /;} else {reg =/^ [0-9] * [0-9] [0-9] * $/;} break; case "+ -": // integer reg =/(^ -? | ^ \ + ?) \ D + $/; break; case "+": if (! Bolzero) {// positive integer reg =/^ \ +? [0-9] * [1-9] [0-9] * $/;} else {// positive integer + 0 // reg =/^ \ +? \ D + $/; reg =/^ \ +? [0-9] * [0-9] [0-9] * $/;} break; case "-": if (! Bolzero) {// negative integer reg =/^-[0-9] * [1-9] [0-9] * $ /;} else {// negative integer + 0 // reg =/^-\ d + $ /; reg =/^-[0-9] * [0-9] [0-9] * $/;} break; default: alert ("Check symbol parameters, only (null, +,-) "); return false; break;} var r = objStr. match (reg); if (r = null) {return false;} else {return true ;}}/*

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CheckIsValidDate (string): determines whether the date type is correct. Must be yyyy-MM-dd

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*/Function checkIsValidDate (str) {// if it is null, if (str = "") return true is verified; var pattern =/^ \ d {4} \/\ d {1, 2} \/\ d {1, 2} $/g; if (! Pattern. test (str) return false; // alert ("[" + str + "] 1"); var arrDate = str. split ("/"); var date = new Date (arrDate [0], (parseInt (arrDate [1], 10)-1) + "", parseInt (arrDate [2], 10) + ""); // alert ("a: [" + date. getFullYear () + "] [" + date. getMonth () + "] [" + date. getDate () + "]"); // alert ("B: [" + arrDate [0] + "] [" + parseInt (arrDate [1], 10) + "] [" + parseInt (arrDate [2], 10) + "]"); if (date. getFullYear () = arrDate [0] & date. getMonth () = (parseInt (arrDate [1], 10)-1) + "" & date. getDate () = parseInt (arrDate [2], 10) + "") return true; else // alert ("[" + str + "] 2 "); return false ;}/*

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CheckIsValidTime (string): determines whether the time type is correct. Must be hh: mm: ss

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*/Function checkIsValidTime (str) {// if it is null, verify if (str = "") return true; var pattern =/^ \ d {1, 2 }: \ d {1, 2 }:\ d {1, 2} $/g; if (! Pattern. test (str) return false; // alert ("[" + str + "] 1"); return true ;}/*

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CheckedCount (containForm, chkFormName): calculates the number of phases selected in a form. check forms include radiobox and checkbox parameters: form containing check items, and name of check Forms

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*/Function CheckedCount (containForm, chkFormName) {var chkCount = 0; for (I = 0; I <containForm. elements. length; I ++) {if (containForm. elements [I]. name = chkFormName) {if (containForm. elements [I]. type = 'checkbox' | containForm. elements [I]. type = 'Radio ') {if (containForm. elements [I]. checked) {chkCount ++ ;}}} return chkCount ;}/ *** determines whether the email address is valid */function IsValidateEmail (str ){ // If it is null, if (str = "" | str. length = 0) {return false;} // Regular Expression // var pattern =/^ \ w {1 ,}@[\., \ w] {1 ,}$/; var pattern =/^ \ w + ([-+.] \ w +) * @ \ w + ([-.] \ w + )*\. \ w + ([-.] \ w +) * $/; if (! Pattern. test (str) {return false;} return true;}/*** determines whether a valid Chinese character */function checkIsHanzi (str) {// if it is null, if (str = "" | str. length = 0) {return true;} // Regular Expression var pattern =/[^ \ u4E00-\ u9FA5]/g; if (pattern. test (str) {return false;} return true;}/*** determines whether the English letter is valid + (Space) */function checkIsLetter (str) {// if it is null, if (str = "" | str. length = 0) {return true;} // Regular Expression var patt Ern =/[^ a-zA-Z \ s]/g; if (pattern. test (str) {return false;} return true;}/*** determines whether the English letter is valid + (space or dot) */function checkIsLetterOrSpaceDot (str) {// if it is null, if (str = "" | str. length = 0) {return true;} // Regular Expression var pattern =/[^ a-zA-Z \ s \.] /g; if (pattern. test (str) {return false;} return true;}/*** determines whether a valid English letter or number */function checkIsLetterNumber (str) {// if it is null, if (str = "" | str. Length = 0) {return true;} // Regular Expression var pattern =/[^ a-zA-Z0-9 \ s]/g; if (pattern. test (str) {return false;} return true;}/*** determines whether the digit is a valid number (check the credential number and password) */function checkIsNumber (str) {// if it is null, if (str = "" | str. length = 0) {return true;} // Regular Expression var pattern =/[^ 0-9 \ s]/g; if (pattern. test (str) {return false;} return true;}/*** determines whether the percentage number is valid */function checkIsPercent (str ){/ /If it is null, if (str = "" | str. length = 0) {return true;} // Regular Expression var pattern =/^ [1-9] [0-9] * % $/g; if (! Pattern. test (str) {return false;} return true;}/*** check is validate time */function isValidateTime (str) {if (parseInt (str) = 0) {return true;} var regexp =/^ ([0-9]) | (0 [0-9]) | (1 [0-9]) | (2 [0-3]) [0-5] [0-9] $/if (str = "" | str. length = 0) {return false;} if (! Regexp. test (str) {return false;} return true;}/*** determines whether the mobile phone number is valid *. return true if the format is correct; otherwise, false. */function IsValidateMobile (str) {var pattern =/^ (\ d {2, 3} \) | (\ d {3 }\-))? 13 \ d {9 }$/; if (str = ''| str. length = 0) {return false;} if (! Pattern. test (str) {return false;} return true;}/*** determines whether the phone number is valid. * If the phone number format is correct, return true. Otherwise, false. */function IsValidatePhone (str) {var pattern =/^ (\ d {2, 3} \) | (\ d {3 }\-))? (\ (0 \ d {2, 3} \) | 0 \ d {2, 3 }-)? [1-9] \ d {6, 7} (\-\ d {1, 4 })? $/; If (str = ''| str. length = 0) {return false;} if (! Pattern. test (str) {return false;} return true;}/*** determines whether the zip code is valid. * If the format is correct, true is returned. Otherwise, false is returned. */function IsValidateZipcode (str) {var pattern =/^ [1-9] \ d {5} $/; if (str = ''| str. length = 0) {return false;} if (! Pattern. test (str) {return false;} return true ;}