//供使用者調用 function trim(s){   return trimRight(trimLeft(s)); } //去掉左邊的空白 function trimLeft(s){   if(s == null) {     return "";   }   var whitespace = new String(" /t/n/r");   var str = new String(s);   if (whitespace.indexOf(str.charAt(0)) != -1) {     var j=0, i = str.length;     while (j < i && whitespace.indexOf(str.charAt(j)) != -1){       j++;     }     str = str.substring(j, i);   }   return str; } //去掉右邊的空白 www.49028c.com function trimRight(s){   if(s == null) return "";   var whitespace = new String(" /t/n/r");   var str = new String(s);   if (whitespace.indexOf(str.charAt(str.length-1)) != -1){     var i = str.length - 1;     while (i >= 0 && whitespace.indexOf(str.charAt(i)) != -1){       i--;     }     str = str.substring(0, i+1);   }   return str; }     

<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>

//去左空格;function ltrim(s){  return s.replace(/(^/s*)/g, "");}//去右空格;function rtrim(s){  return s.replace(/(/s*$)/g, "");}//去左右空格;function trim(s){  return s.replace(/(^/s*)|(/s*$)/g, "");}

$.trim(str) 

function trim(str){    return str.replace(/^(/s|/u00A0)+/,'').replace(/(/s|/u00A0)+$/,'');  }

function trim(str){    return str.replace(/^(/s|/xA0)+|(/s|/xA0)+$/g, '');  } 

function trim(str){    str = str.replace(/^(/s|/u00A0)+/,'');    for(var i=str.length-1; i>=0; i--){      if(//S/.test(str.charAt(i))){        str = str.substring(0, i+1);        break;      }    }    return str;  } 

//----------------------------------------------------------//   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;    }  }}