如何使Bootstrap 3导航栏在所有屏幕尺寸下均保持折叠状态

问题描述

在引导程序3中，我希望所有屏幕尺寸的导航栏默认都处于折叠状态.

In bootstrap 3, I want the navbar to be collapsed by default for all screen sizes.

我在此处发现，Bootstrap 3首先是移动设备，其导航栏默认情况下是折叠"的，当达到一定的最小大小时会扩展".在那篇文章之后，我尝试使用 @ grid-float-breakpoint 来查找自定义CSS ，但我无处可去.请从这里引导我.

I have found here that Bootstrap 3 being mobile first, its navbar is "collapsed" by default and and "expands" when it reaches a certain minimum size.. Following that post, I tried messing around with @grid-float-breakpoint for customized css, but I got nowhere. Please guide me from here.

推荐答案

您可以使用CSS覆盖 Bootstrap 3 的默认设置.例如，这会将导航栏设置为在屏幕宽度小于2000像素(可容纳大多数屏幕)时折叠..

You could use CSS to override the Bootstrap 3 defaults. For example, this would set the navbar to collapse on screen widths less than 2000 pixels (accommodating most screens)..

@media (max-width: 2000px) {
    .navbar-header {
        float: none;
    }
    .navbar-left,.navbar-right {
        float: none !important;
    }
    .navbar-toggle {
        display: block;
    }
    .navbar-collapse {
        border-top: 1px solid transparent;
        box-shadow: inset 0 1px 0 rgba(255,255,255,0.1);
    }
    .navbar-fixed-top {
        top: 0;
        border-width: 0 0 1px;
    }
    .navbar-collapse.collapse {
        display: none!important;
    }
    .navbar-nav {
        float: none!important;
        margin-top: 7.5px;
    }
    .navbar-nav>li {
        float: none;
    }
    .navbar-nav>li>a {
        padding-top: 10px;
        padding-bottom: 10px;
    }
    .collapse.in{
        display:block !important;
    }
}

演示: http://www.bootply.com/122572

Bootstrap 4(测试版)更新

在Bootstrap 4中，导航栏默认情况下总是折叠到移动/汉堡包版本中:演示. navbar-expand-* 类用于更改断点.

In Bootstrap 4 the navbar is always collapsed into the mobile/hamburger version by default: Demo. The navbar-expand-* class are used to change the breakpoint.

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