我使用这个香草js函数添加“模态打开”类的身体。(根据smhmic的回答)

function freezeScroll(show, new_width)
{
    var innerWidth = window.innerWidth,
        clientWidth = document.documentElement.clientWidth,
        new_margin = ((show) ? (new_width + innerWidth - clientWidth) : new_width) + "px";

    document.body.style.marginRight = new_margin;
    document.body.className = (show) ? "modal-open" : "";
};

您需要超越@charlietfl的答案并考虑滚动条，否则您可能会看到一个文档回流。

打开模式:

记录身体宽度 将正文溢出设置为隐藏 显式地将主体宽度设置为步骤1中的宽度。 Var $body = $(document.body); var oldWidth = $body.innerWidth(); 美元body.css(“溢出”,“隐藏”); 美元body.width (oldWidth);

关闭模态:

将body overflow设置为auto 将车身宽度设置为auto Var $body = $(document.body); 美元body.css(“溢出”,“汽车”); 美元body.width(“自动”);

灵感来源:http://jdsharp.us/jQuery/minute/calculate-scrollbar-width.php

我对Bootstrap 3的解决方案:

.modal {
  overflow-y: hidden;
}
body.modal-open {
  margin-right: 0;
}

因为对我来说唯一的溢出:隐藏在身上。模态打开类并没有阻止页面向左移动，因为原始的右距:15px。

这是

body.modal-open {
   overflow: hidden !important;
}

对于那些使用SharePoint 2013的人，有一个小提示。主体已经有overflow: hidden。你要找的是设置overflow:隐藏在id为s4-workspace的div元素上，例如。

var body = document.getElementById('s4-workspace');
body.className = body.className+" modal-open";

这个解决方案对我很有效:

var scrollDistance = 0; $(document).on("show.bs.modal", ".modal", function () { scrollDistance = $(window).scrollTop(); $("body").css("top", scrollDistance * -1); }); $(document).on("hidden.bs.modal", ".modal", function () { $("body").css("top", ""); $(window).scrollTop(scrollDistance); }); .content-area { height: 750px; background: grey; text-align: center; padding: 25px; font-weight:700; font-size: 30px; } body.modal-open { position: fixed; left: 0; width: 100%; } <link href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.css" rel="stylesheet"/> <script src="https://code.jquery.com/jquery-3.4.1.slim.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.js"></script> <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.js"></script> <div class="content-area"> Scroll Down To Modal Button<br/> <svg xmlns="http://www.w3.org/2000/svg" width="56" height="56" fill="currentColor" class="bi bi-arrow-down" viewBox="0 0 16 16"> <path fill-rule="evenodd" d="M8 1a.5.5 0 0 1 .5.5v11.793l3.146-3.147a.5.5 0 0 1 .708.708l-4 4a.5.5 0 0 1-.708 0l-4-4a.5.5 0 0 1 .708-.708L7.5 13.293V1.5A.5.5 0 0 1 8 1z"/> </svg> </div> <center class="my-3"> <button type="button" class="btn btn-primary" data-toggle="modal" data-target="#exampleModal"> Launch demo modal </button> </center> <div class="content-area"></div> <!-- Modal --> <div class="modal fade" id="exampleModal" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true"> <div class="modal-dialog" role="document"> <div class="modal-content"> <div class="modal-header"> <h5 class="modal-title" id="exampleModalLabel">Modal title</h5> <button type="button" class="close" data-dismiss="modal" aria-label="Close"> <span aria-hidden="true">&times;</span> </button> </div> <div class="modal-body"> <p>Cras mattis consectetur purus sit amet fermentum. Cras justo odio, dapibus ac facilisis in, egestas eget quam. Morbi leo risus, porta ac consectetur ac, vestibulum at eros.</p> <p>Praesent commodo cursus magna, vel scelerisque nisl consectetur et. Vivamus sagittis lacus vel augue laoreet rutrum faucibus dolor auctor.</p> </div> <div class="modal-footer"> <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button> <button type="button" class="btn btn-primary">Save changes</button> </div> </div> </div> </div>

基本上，当打开模态时，它会为主体添加一个负顶部，以在打开模态之前保持窗口滚动位置。关闭模态时，窗口滚动保持使用相同的值应用于顶部时，打开。 这种方法可以防止身体滚动。

这是一把能用的小提琴