javascript去掉空格

去掉两头的空格代码如下:
       var str = "          shc dhf              ";
       var c = str.replace(/(^/s*)|(/s*$)/g,"");
        var length= c.length;
       length的值为7
去掉左边的空格:
       var b = str.replace(/(^/s*)/g, "");   
去掉右边的空格:
        var d = str.replace(/(/s*$)/g, "");