str为要去除空格的字符串:去除所有空格: str = str.replace(/\s+/g,""); 去除两头空格: str = str.replace(/^\s+|\s+$/g,"");去除左空格：str=str.replace( /^\s*/, ‘‘);去除右空格：str=str.replace(/(\s*$)/g, "");SCRIPT LANGUAGE="JavaScript"> <!-- //出处:网上搜集 // Trim() , Ltrim() , RTrim() String.prototype.Trim = function() { returnthis.replace(/(^\s*)|(\s*$)/g, ""); } String.prototype.LTrim = function() { returnthis.replace(/(^\s*)/g, ""); } String.prototype.RTrim = function() { returnthis.replace(/(\s*$)/g, ""); } //--> </SCRIPT> <input type="text" value=" 前后都是空格 " id="space"> <input type="button" value="去前后空格" onclick="javascript:document.getElementById(‘space‘).value=document.getElementById(‘space‘).value.Trim();document.getElementById(‘space‘).select();"> <input type="button" value="去前空格" onclick="javascript:document.getElementById(‘space‘).value=document.getElementById(‘space‘).value.LTrim();document.getElementById(‘space‘).select();"> <input type="button" value="去后空格" onclick="javascript:document.getElementById(‘space‘).value=document.getElementById(‘space‘).value.RTrim();document.getElementById(‘space‘).select();"> <input type="button" value="还原" onclick="javascript:document.getElementById(‘space‘).value=‘ 前后都是空格 ‘;"> <a href="http://www.yaoasnsi.com" target="_blank">访问yaosansi.com</a> 去除所有空格: str = str.replace(/\s+/g,"");去除两头空格: str = str.replace(/^\s+|\s+$/g,"");去除空格(TimeSheet用过)arg0=arg0.replace(/\s+$|^\s+/g,"");




来源：http://www.cnblogs.com/fumj/p/3406420.html