Use JS to remove the front and back space or the middle space Daquan

1. remove all spaces before and after the string :

--JS to achieve the trim function

Remove all empty strings before and after the string
function Trim (str)         {              return str.replace (/(^\s*) | ( \s*$)/g, "");      }
Adding a method to a string prototype can also
String.prototype.Trim = function ()
{
    Return This.replace (/(^\s*) | ( \s*$)/g, "");
}

Remove Space before string
function () {     returnthis. Replace (/(^\s*)/g, "");}

Remove space after string

function () {    returnthis. Replace (/(\s*$)/g, "");}

Description:

If you use jquery to directly use the $. Trim(str) method, str indicates that you want to remove all the spaces before and after the string.

--function to remove whitespace on both sides of a string

Parameter: MyStr passed in string
Return: String mystr

// Remove Front spaces function Trim (mystr) {   while ((Mystr.indexof (") ==0) && (mystr.length>1 )) {    mystr =mystr.substring (1, mystr.length);   }

Remove trailing spaces
while ((Mystr.lastindexof (") ==mystr.length-1) && (mystr.length>1)) {
Mystr=mystr.substring (0,mystr.length-1);
}

  if (mystr== "") {
    Mystr= "";
   }
    return mystr;
}

str = str.replace (/[]/g, "");//Replace all blanks//Erase All BlanksfunctionAllTrim (s) {varS1 =LTrim (s); return(RTrim (S1));}//Delete left blank (with Fullwidth blank)functionLTrim (s) {s= "" +s; varLen =s.length; varpos = 0; varS1 = "";  while(Pos <Len) {        varCHR = s.substring (pos, pos + 1); if(Chr = = "" | | CHR = = "" | | CHR = = "") Pos= pos + 1; Else            return(s.substring (Pos,len)); }    returnS1;}//Remove right margin (with Fullwidth Blanks)functionRTrim (s) {s= "" +s; varLen =s.length; varpos = len-1; varS1 = ""; vari = 0;  while(POS >= 0)    {        varCHR = s.substring (pos, s.length-i); if(Chr = = "" | | CHR = = "" | | CHR = = "") Pos= Pos-1; Else            return(s.substring (0, POS +1)); I++; }    returnS1;}//Remove extra space in the string (keep a blank)functionMiddletrim (str) {varRepstr= "";  for(vari=0;i<str.length;i++)    {        if(Str.substring (i,i+1)! = "") Repstr=repstr+str.substring (i,i+1); Else        {            if(Repstr.substring (repstr.length-1,repstr.length)! = "") {Repstr=repstr+ ""; }        }    }    returnrepstr;}

2, Remove all the spaces in the string (including the middle space, you need to set the 2nd parameter is: g)

function Trim (Str,is_global)        {            var  result;             = Str.replace (/(^\s+) | ( \s+$)/g, "");             if (is_global.tolowercase () = = "G")            {                = Result.replace (/\s/g, "");             }             return result;}

Use JS to remove the front and back space or the middle space Daquan