完美解决safari、微信浏览器下拉回弹效果，只保留局部回弹效果。

CSS代码

.box{  overflow: auto;  -webkit-overflow-scrolling: touch;}

HTML代码

JS代码

var overscroll = function(el) {    el.addEventListener('touchstart', function() {        var top = el.scrollTop        ,totalScroll = el.scrollHeight        ,currentScroll = top + el.offsetHeight;        if(top === 0) {            el.scrollTop = 1;        }else if(currentScroll === totalScroll) {            el.scrollTop = top - 1;        }    });    el.addEventListener('touchmove', function(evt) {    if(el.offsetHeight < el.scrollHeight)        evt._isScroller = true;    });}        overscroll(document.querySelector('.scroll'));document.body.addEventListener('touchmove', function(evt) {    if(!evt._isScroller) {        evt.preventDefault();    }});