移动端处理图片懒加载

//照片墙图片懒加载
function lazyLondImg() {
    var lazyImgs = $(".js-lazyLoad"), //需要懒加载的图片
        lazyIndex = 0, //加载到的图片index
        curHeight = document.documentElement.clientHeight, //初始页面高度
        myY = 0, tmpY = 0;
    function showImg() {
        for(var i = lazyIndex; i < lazyImgs.length; i++){
            var curImgEle = lazyImgs[i];
            var imgTop = curImgEle.parentNode.offsetTop;
            if((imgTop-$("body").scrollTop()) <= curHeight + 10){
//                页面初始化加载浏览器可见区域图片
                lazyIndex = i;
                curImgEle.setAttribute("src",curImgEle.getAttribute("datasrc"));
            }else{
                break;
            }
        }
    }
    showImg();
    document.body.addEventListener("touchstart",function (event) {
        myY = event.touches[0].clientY;
    });
    document.body.addEventListener("touchmove",function (event) {
        tmpY = event.touches[0].clientY;
        if(myY - tmpY >= 10){
            showImg();
        }
    });
    document.body.addEventListener("touchend",function (event) {
        showImg();
    });
}