解决弹出框滚动穿透的问题（问题是body也会滚动）
参考 https://uedsky.com/2016-06/mobile-modal-scroll/ 感谢分享 案例页面：view-source:https://uedsky.com/demo/modal-scroll.html 第一步：给body加上个css类别样式 body.modal-open { position: fixed; width: 100%; } 第二部：创建核心函数： /** * ModalHelper helpers resolve the modal scrolling issue on mobile devices * https://github.com/twbs/bootstrap/issues/15852 * requires document.scrollingElement polyfill https://github.com/yangg/scrolling-element */ var ModalHelper = (function(bodyCls) { var scrollTop; return { //打开弹窗 afterOpen: function() { scrollTop = document.scrollingElement.scrollTop; document.body.classList.add(bodyCls);