摘要：
function（event）｛event.prpreventDefault（）；false）；varoverscroll=function（el）｛el.addEventListener（'touchstart‘，function（）｛vartop=el.sollTop，currentScroll=top+el.offsetHeight；
开发项目跑在微信浏览器经常会遇到一个问题，微信浏览器下拉的时候会出现自带的黑色底色（显示网址）如下图：
此类事件是手机touchmove默认事件行为，可以通过js代码隐藏事件：
$(‘body’).on(‘touchmove’, function (event) {event.preventDefault();}); or document.addEventListener('touchmove', function(e){e.preventDefault()}, false);
但这样往往会把页面原生的scroll效果也一同去掉了，下面的代码可以完美解决这个问题：
var overscroll = function(el) { el.addEventListener('touchstart', function() { var top = el.scrollTop , totalScroll = el.scrollHeight , currentScroll = top + el.offsetHeight; //If we're at the top or the bottom of the containers //scroll, push up or down one pixel. // //this prevents the scroll from "passing through" to //the body. if(top === 0) { el.scrollTop = 1; } else if(currentScroll === totalScroll) { el.scrollTop = top - 1; } }); el.addEventListener('touchmove', function(evt) { //if the content is actually scrollable, i.e. the content is long enough //that scrolling can occur if(el.offsetHeight < el.scrollHeight) evt._isScroller = true; }); } overscroll(document.querySelector('.scroll')); document.body.addEventListener('touchmove', function(evt) { //In this case, the default behavior is scrolling the body, which //would result in an overflow. Since we don't want that, we preventDefault. if(!evt._isScroller) { evt.preventDefault(); } });