浏览器兼容base.js

function scroll(){

            if(window.pageYOffset != null){
                return {
                    top:window.pageYOffset,
                    left:window.pageXOffset
                }
            }
            if(document.compatMode == "CSS1compat"){
                return {
                    top:document.documentElement.scrollTop,
                    left:document.documentElement.scrollLeft
                }
            }

            return {
                top:document.body.scrollTop,
                left:document.body.scrollLeft
            }

        }

       // console.log(scroll().top);
        //console.log(scroll().left);

  function getStyle(obj,attr){
            if(obj.currentStyle){ //判断ie
                return obj.currentStyle[attr];
            }else{
                return window.getComputedStyle(obj,null)[attr];//标准浏览器
            }
        }