angular之上滑换页指令

healthmallDirectives.directive("goodsTopRefresh", ['$window',function ($window) {

        return {

            link: function (scope,el,attrs) {

                var wai = $window.document.getElementById("outerDiv");

                var content = $window.document.getElementById("goodsnei")

                wai.addEventListener("scroll", function (e) {

                    var waiHeight = wai.offsetHeight;

                    var contentHeight = content.offsetHeight;

                    var waiTop = wai.scrollTop;

                    if(waiTop+ waiHeight-40 >= contentHeight){

                        var startY;

                        var endY;

                        content.addEventListener("touchstart", function (e){

                            startY = e.changedTouches[0].pageY;

                        });

                        content.addEventListener("touchend", function (e){

                            endY= e.changedTouches[0].pageY;

                            if(startY -endY>=80){

                                scope.$apply(attrs.toptorefresh);

                            }

                        });

                    }

                })

            }

        };

    }]);

　　获得滚动页的大小和内容页大小，通过touchStart和touchEnd判断页面是否是上滑，若上滑则执行toptorefresh属性中的方法