javascript中封装scoll()方法

  function scroll() {
        var scrollTop = window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop || 0;
        var scrollLeft = window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft || 0;

        var o = {};
        o.top = scrollTop;
        o.left = scrollLeft;
        return o;

    }