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, "");
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, "");