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, "");
转载自:三味书屋