同事的分享,记录下来。css
代码以下:html
css:web
body.modal-open { position: fixed; width: 100%; }
js:app
// 兼容低版本 document.scrollingElement写法 (function () { if (document.scrollingElement) { return; } var element = null; function scrollingElement () { if (element) { return element; } else if (document.body.scrollTop) { // speed up if scrollTop > 0 return (element = document.body); } var iframe = document.createElement('iframe'); iframe.style.height = '1px'; document.documentElement.appendChild(iframe); var doc = iframe.contentWindow.document; doc.write('<!DOCTYPE html><div style="height:9999em">x</div>'); doc.close(); var isCompliant = doc.documentElement.scrollHeight > doc.body.scrollHeight; iframe.parentNode.removeChild(iframe); return (element = isCompliant ? document.documentElement : document.body); } Object.defineProperty(document, 'scrollingElement', { get: scrollingElement }); })(); var ModalHelper = (function (bodyCls) { var scrollTop; return { afterOpen: function () { scrollTop = document.scrollingElement.scrollTop; document.body.classList.add(bodyCls); document.body.style.top = -scrollTop + 'px'; }, beforeClose: function () { document.body.classList.remove(bodyCls); // scrollTop lost after set position:fixed, restore it back. document.scrollingElement.scrollTop = scrollTop; } }; })('modal-open');
而后在打开遮罩层的地方添加以下js:优化
ModalHelper.afterOpen();
在关闭遮罩层的地方添加以下js:spa
ModalHelper.beforeClose();
这样,你不再用由于页面的滑动穿透而烦恼啦~rest
顺便再分享一些关于滚动的优化方法:code
1.消除难看的滚动条:在父元素的css添加以下代码htm
scrollbar-width: none; ::-webkit-scrollbar {display:none}
2.让滚动显得更加流畅:在父元素的css添加以下代码blog
overflow-y: scroll; /* 增长弹性滚动,解决滚动不流畅的问题 */ -webkit-overflow-scrolling: touch;