Javascript 5 ways to filter delete before and after all spaces

First: cyclic check replacement//for the user to invokefunctionTrim (s) {returnTrimRight (Trimleft (s));} //Remove the left blankfunctionTrimleft (s) {if(s = =NULL) {     return""; }   varwhitespace =NewString ("\t\n\r"); varstr =NewString (s); if(Whitespace.indexof (Str.charat (0))! =-1) {     varj=0, i =str.length;  while(J < i && Whitespace.indexof (Str.charat (j))! =-1) {J++; } STR=Str.substring (J, I); }   returnstr;} //Remove the blank www.jb51.net on the rightfunctionTrimRight (s) {if(s = =NULL)return""; varwhitespace =NewString ("\t\n\r"); varstr =NewString (s); if(Whitespace.indexof (Str.charat (str.length-1))! =-1){     vari = Str.length-1;  while(I >= 0 && whitespace.indexof (str.charat (i))! =-1) {i--; } STR= str.substring (0, i+1); }   returnstr;} 

the second type: regular replacement<script language= "JavaScript" > <!--String.prototype.Trim=function() { return  This. Replace (/(^\s*) | ( \s*$)/g, ""); } String.prototype.LTrim=function() { return  This. Replace (/(^\s*)/g, ""); } String.prototype.RTrim=function() { return  This. Replace (/(\s*$)/g, ""); } // -</SCRIPT>//go left space;functionLTrim (s) {returnS.replace (/(^\s*)/g, "");}//go to the right space;functionRTrim (s) {returnS.replace (/(\s*$)/g, "");}//to the left and right spaces;functionTrim (s) {returnS.replace (/(^\s*) | ( \s*$)/g, "");}

the third type: Using Jquery$.trim (str) jquery internal implementation is:functionTrim (str) {returnStr.replace (/^ (\s|\u00a0) +/, '). Replace (/(\S|\U00A0) +$/, '); } The fourth type: using MotoolsfunctionTrim (str) {returnStr.replace (/^ (\s|\xa0) +| ( \S|\XA0) +$/g, "); } Fifth: clipping string modefunctionTrim (str) {str= Str.replace (/^ (\s|\u00a0) +/, ");  for(varI=str.length-1; i>=0; i--){      if(/\s/. Test (Str.charat (i))) {STR= str.substring (0, i+1);  Break; }    }    returnstr; }

//   去掉字符串前后的空格

//  返回值：

//  去除空格后的字符串

//----------------------------------------------------------

function trim(param) {

   if ((vRet = param) == ‘‘ ) { return vRet; }

   while ( true ) {

     if (vRet.indexOf ( ‘ ‘ ) == 0) {

       vRet = vRet.substring(1, parseInt(vRet.length));

     } else if ((parseInt(vRet.length) != 0) && (vRet.lastIndexOf ( ‘ ‘ ) == parseInt(vRet.length) - 1)) {

       vRet = vRet.substring(0, parseInt(vRet.length) - 1);

     } else {

       return vRet;

     }

   }

}

Javascript 5 ways to filter delete before and after all spaces