懒加载（滚动加载）

Posted 2022-12-03 jianxin1994

canILoad:function(elem,method)
            var scrollDistance = document.body.scrollTop||document.documentElement.scrollTop;   //获取滚动距离
            var availableViewHeight = document.body.clientHeight;   //可视区域高度
            var advancedDistance = 30;  //提前多少开始加载
            
            if(scrollDistance + availableViewHeight > elem.offsetTop - advancedDistance)
                if(!elem.isLoad)
                    console.log("加载成功");
                    if(typeof(method)==="function")
                        method();
                        elem.isLoad = true;
                    else
                        console.log("加载失败");