javascript - 如何使用固定的后台和窗口滚动而不是 div 构建 html 模式

Question

我正在尝试实现一个模态(覆盖在页面上)，其中背景中的页面准确地停留在实际滚动位置但不滚动，而在前景中有一个模态，当窗口元素滚动时卷轴。

因此“旧”页面应该像正文的固定背景一样位于模态后面，模态应该像普通页面一样滚动。

由于我使用的是响应式(Reactive)网络框架( meteor )，当时不清楚显示的是什么，显示的是模态。

如果可以避免页面中间的水平移动，当显示或隐藏滚动条时，那会很酷。

我的实际 html 是这样的:

当显示模式时，.page-content 应该固定在适当的位置和滚动位置(所以当我向上滚动时，“视口(viewport)”应该完全保持不变，(以及 .modal-background，基本上就是那个灰色平面，而 .modal-inner 应该随页面正常滚动。

理想情况下，模态的显示/隐藏应该通过设置 '.modal-container' 的 display:block 或 display:none 来解决，或许可以给 .page-contents 一个额外的类。

Answer 1

是这样的吗？

body{position:fixed;top:0px;background-image: url('http://lorempixel.com/output/fashion-q-c-1560-883-1.jpg');
}
#innerDiv{background-color:grey;width:90%;height:900px;position:relative;left:40px;top:20px;}
#modal{width:85%;max-height:400px;z-index:3;position:relative;top:20px;left:30px;overflow-y:scroll;}

<div id="background"></div>
<div id="innerDiv">
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