prevent:function () {var startX = 0, startY = 0;//touchstart事件function touchSatrtFunc(evt) {try{//evt.preventDefault(); //阻止觸摸時瀏覽器的縮放、滾動條滾動等var touch = evt.touches[0]; //獲取第一個觸點var x = Number(touch.pageX); //頁面觸點X坐標var y = Number(touch.pageY); //頁面觸點Y坐標//記錄觸點初始位置startX = x;startY = y;} catch (e) {alert('touchSatrtFunc：' + e.message);}}document.addEventListener('touchstart', touchSatrtFunc, false);var _ss = document.getElementById("contain");_ss.ontouchmove = function (ev) {var _point = ev.touches[0],_top = _ss.scrollTop;// 什么時候到底部var _bottomFaVal = _ss.scrollHeight - _ss.offsetHeight;// 到達頂端if (_top === 0) {// 阻止向下滑動if (_point.clientY > startY) {ev.preventDefault();} else {// 阻止冒泡// 正常執(zhí)行ev.stopPropagation();}} else if (_top === _bottomFaVal) {// 到達底部// 阻止向上滑動if (_point.clientY < startY) {ev.preventDefault();} else {// 阻止冒泡// 正常執(zhí)行ev.stopPropagation();}} else if (_top > 0 && _top < _bottomFaVal) {ev.stopPropagation();} else {ev.preventDefault();}};}