javascript - 在某个 block 上隐藏浏览器滚动条

Question

这是我的问题。

<aside class="fixed-col">
<div class="fix-wrap cf">
    <div class="fixed-col-inner">
        <h1>lorem</h1>
        <div class="menu-button">
            <a href="#" onclick="return false"></a>
        </div><!-- menu-button -->
        <input type="text" id="search" placeholder="...">
        <button class="search-button"></button>
        <div class="fav-wrap">
            <a href="#" class="fav">ipsum (0)</a>
        </div><!-- fav-wrap -->
        <div class="menu-side">
            <img src="img/userpic.png" height="31" width="31" alt="">
            <a href="#" class="username">xxx xxx</a>
            <a href="#" class="logout">xxx</a>
            <ul class="main-nav">
                <li><a href="#">lorem</a></li>
                <li><a href="#" class="add">ipsum</a></li>
                <li class="last-li"></li>
            </ul>
            <ul class="second-nav">
                <li>
                    <a href="#">HOVER ME AND SEE</a>
                    <div class="hidden-nav">
                    </div><!-- hidden-nav -->
                </li>
                <li><a href="#">amet</a></li>
                <li><a href="#">1</a></li>
                <li><a href="#">2</a></li>
                <li><a href="#">3</a></li>
            </ul>
        </div><!-- menu-side -->
        <ul class="social">
            <li class="facebook"><a href="#"></a></li>
        </ul>
    </div><!-- fixed-col-inner -->
    </div>
</aside><!-- fixed-col -->

CSS

html, body {
        margin: 0;
        height: 100%;
    }

    .fixed-col {
        width: 290px;
        height: 100%;
        position: fixed;
        left: 0;
        background: url(../img/menu-bg.jpg) no-repeat;
        background-size: 100% 100%;
        overflow-y: auto;
        overflow-x: hidden; 
    }

    .fix-wrap {
        background: rgba(0, 0, 0, 0.8);
        min-height: 100%;
    }

    .fixed-col-inner {
        height: 100%;
        position: relative;
    }

    .fixed-col-inner h1 {
        margin: 0;
        font: 24px/90px Arial;
        color: #fff;
        margin-left: 30px;
    }

    .menu-button {
        width: 36px;
        height: 32px;
        position: absolute;
        background: rgba(0, 0, 0, 0.6);
        right: 30px;
        top: 30px;
        border-radius: 2px;
    }

    .menu-button a {
        display: block;
        background: url(../img/menu-button-bg.png) center center no-repeat;
        width: 36px;
        height: 32px;
    }

    .menu-button:hover {
        background: #5b5c5b;
    }

    .fixed-col-inner input {
        width: 230px;
        height: 40px;
        border: none;
        background: rgba(0, 0, 0, 0.4);
        outline: none;
        color: #c4c4c4;
        margin-left: 30px;
        padding: 0 40px 0 15px;
    }

    button.search-button {
        width: 17px;
        height: 17px;
        display: block;
        border: none;
        outline: none;
        background: url(../img/search-icon.png) center center no-repeat;
        position: absolute;
        right: 46px;
        top: 101px;
        cursor: pointer;
    }

    .fav-wrap {
        text-align: center;
        margin: 25px 30px 0;
        border-bottom: 1px solid #51504f;
        padding-bottom: 30px;
        background: url(../img/star.png) 30% 7% no-repeat;
    }

    a.fav {
        display: inline-block;
        padding-left: 27px;
        color: #fff;
        text-decoration: none;
        font: 14px Calibri;
    }

    a.fav:hover {
        text-decoration: underline;
    }

    .menu-side {
        padding-top: 25px;
    }

    .menu-side img {
        max-width: 31px;
        max-height: 31px;
        display: block;
        margin: 0 auto 10px;
    }

    .username {
        display: table;
        margin: 0 auto;
        font: 14px Calibri;
        color: #fff;
        text-decoration: none;
    }

    .username:hover, .logout:hover {
        text-decoration: underline;
    }

    .logout {
        display: table;
        margin: 8px auto 0;
        font: 12px Calibri;
        color: #84e5df;
        text-decoration: none;
    }

    .main-nav {
        margin: 15px 0 0 0;
        padding: 0;
        list-style-type: none;
    }

    .main-nav li {
        display: block;
    }

    .main-nav li:hover {
        background: #4d4d4d;
    }

    .main-nav li a {
        font: 14px/39px Calibri;
        color: #f5f5f5;
        text-decoration: none;
        display: block;
        background: url(../img/paper-empty.png) left center no-repeat;
        padding-left: 30px;
        margin-left: 30px;
    }

    .main-nav li a.add {
        background: url(../img/paper-add.png) left center no-repeat;
    }

    .last-li {
        margin: 15px 30px 0;
        border-bottom: 1px solid #51504f;
    }

    .second-nav {
        margin: 0;
        padding: 0;
        list-style-type: none;
        max-height: 0px;
        overflow: hidden;
        opacity: 0;
        visibility: hidden;
        transition: all .5s ease;
    }

    .second-nav li {
        display: block;
    }

    .second-nav li:first-child {
        margin-top: 15px;
    }

    .second-nav li:hover {
        background: #4d4d4d;
    }

    .second-nav li a {
        font: bold 16px/39px Calibri;
        color: #f5f5f5;
        text-decoration: none;
        display: block;
        padding-left: 30px;
    }

    .menu-side:hover .second-nav{
        max-height: 5000px;
        opacity: 1;
        visibility: visible;
        overflow: visible;
    }

    .social {
        margin: 30px 30px 0 30px; 
        padding: 0;
        text-align: center;
    }

    .social li {
        display: inline-block;
        vertical-align: middle;
        margin: 0 5px;
    }

    .social li a {
        vertical-align: middle;
    }

    .facebook a {
        background: url(../img/facebook-ico.png) center center no-repeat;
        display: block;
        width: 10px;
        height: 18px;
    }

    .vk a {
        background: url(../img/vk-ico.png) center center no-repeat;
        display: block;
        width: 24px;
        height: 14px;
    }

    .second-nav a:hover + .hidden-nav, .hidden-nav:hover {
        width: 200px;
        height: 100%;
        position: fixed;
        top: 0;
        left: 290px;
        background: black;
    }

.hidden-nav悬停他的 parent 时出现 <li> .但是当浏览器高度太小时 - 侧边栏中出现垂直滚动条。我需要它，但正因为如此，我无法将我的街区悬停 .hidden-nav :) 有什么方法可以隐藏侧边栏的滚动条，但它仍然可以滚动吗？)

这里是 JsFiddle Demo .将鼠标悬停在 img 上，您可以看到下拉菜单。将鼠标悬停在“HOVER ME AND SEE”上，您会看到问题))

Answer 1

你可以做的一件事是，将位置 .hidden-nav 向左移动大约 20 像素，这样它就会覆盖滚动条。

如果你不希望它有任何可见的效果，那么你可以将它包装到一个额外的容器元素中来处理定位，并在左侧有一个 20px 的透明边框——像这样，http://jsfiddle.net/20zxfn6r/6

唯一的小缺点 - 如果将鼠标从右侧移动到滚动条上，滚动条可能无法使用，因为它仍会被透明边框覆盖。