JavaScript utility functions

1. Remove string spaces

 /*   go left space   function   LTrim (s) { return  s.replace (/^ (\s*| *)/, " /*   go right space  */ function   RTrim (s) { return  s.replace (/(\s*| *) $/, ""  /*   go to left and right space  */ function   Trim (s) {  LTrim (RTrim (s));}  

2. Get URL Address bar parameters

function Geturlqueryparam (name) {    varnew RegExp ("(^|&)" + name + "= ([^&]*) (&|$)", " I ");     var r = window.location.search.substr (1). Match (reg);     var value = ';     if NULL {        = decodeuricomponent (r[2]);    }     return value;}

3. Digital thousand-point conversion

/*number format conversions thousands of bits*/functionnumtomicrometer (num) {if(Trim (num + "") = = "") {        return""; }    if(IsNaN (num)) {return""; } num= num + ""; if(/^.*\.. *$/. Test (num)) {Varpointindex= Num.lastindexof ("."); Varintpart= num.substring (0, PointIndex); Varpointpart= num.substring (PointIndex + 1, num.length); Intpart= Intpart + ""; varRe =/(-?\d+) (\d{3})/ while(Re.test (Intpart)) {Intpart= Intpart.replace (Re, "$1,$2")} num= Intpart + "." +Pointpart; } Else{num= num + ""; varRe =/(-?\d+) (\d{3})/ while(Re.test (num)) {num= Num.replace (Re, "$1,$2")        }    }    returnnum;}/*remove thousands of bits*/functiondelmicrometer (num) {if(Trim (num + "") = = "") {        return""; } num= Num.replace (/,/gi, "); returnnum;}

4. Get the length of bytes occupied by a given string

functionGetbytelen (val) {//Pass in a string    varLen = 0;  for(vari = 0; i < val.length; i++) {        if(Val[i].match (/[^\x00-\xff]/ig)! =NULL)//Full WidthLen + 2;//if it's full-width, take two bytes        ElseLen+ = 1;//half-width occupies one byte    }    returnLen;}

5. Building URL Parameters

/*param = {name1:value1, name2:value2, ...}*/functionBuildparam (param) {varParamcontent = ' '; Try {        if(!empty (param)) {             for(varKeyinchparam) {paramcontent+ = key + ' = ' +encodeURIComponent (Param[key])+ ' & '; }        }    } Catch(e) {}returnparamcontent;}

6. Determine if the variable is null undefined, NULL, ', FALSE, 0, [], {} return True, otherwise false

functionEmpty (v) {Switch(typeofv) { Case' Undefined ' :            return true;  Case' String ' :            if(Trim (v). length = = 0)                return true;  Break;  Case' Boolean ' :            if(!v)return true;  Break;  Case' Number ' :            if(0 = = =v)return true;  Break;  Case' Object ' :            if(NULL===v)return true; if(Undefined!== v.length && v.length = = 0)                return true;  for(varKinchv) {return false; }            return true;  Break; }    return false;}

7. Remove HTML tags

/* Remove HTML Tags */ function Removehtmltag (str) {    return str.replace (/<[^>]+>/g, "");}

8. Get URL parameters (return array type)

functionGetrequestparam (param) {varurl = location.search;//gets the URL in the "?" String after the character    varParamstr =NewArray (); if(Url.indexof ("?")! =-1) {        varstr = URL.SUBSTR (1); STRs= Str.split ("&");  for(vari = 0; i < strs.length; i++) {            if(param = = strs[i].split ("=") [0]) {Paramstr.push (Strs[i].split ("=") [1]); }        }    }    returnparamstr;}

9. Specify the character Fugauliang

functionsethighlighttext (TXT, currenttargettext) {if(Empty (TXT)) {return‘‘; }    varNewtxt =txt; if(Currenttargettext.length! = 0) {$ (Currenttargettext). each (function(i) {varReg =NewREGEXP (Currenttargettext[i], "G"); Newtxt= Newtxt.replace (Reg, "<em>" +Currenttargettext[i]+ "</em>");    }); }    returnNewtxt;}

10. Replace the specified parameter in the URL

functionchangeurlarg (URL, paramname, paramname_val) {varPattern = paramname + ' = ([^&]*) '; varReplaceText = paramname + ' = ' +Paramname_val; if(Url.match (pattern)) {varTMP = '/(' + paramname + ' =) ([^&]*)/gi '; TMP=Url.replace (eval (TMP), replacetext); returntmp; } Else {        if(Url.match (' [\?] '))) {            returnURL + ' & ' +ReplaceText; } Else {            returnURL + '? ' +ReplaceText; }    }    returnURL + ' \ n ' + paramname + ' \ n ' +Paramname_val;}

JavaScript utility functions