Bootstrap响应式导航由768px变成992px的实现代码

<!--响应式导航部分--> <header role="banner">   <nav role="navigation" class="navbar navbar-static-top navbar-default">     <div class="container ">       <div class="navbar-header">         <!--设置手风琴式的navbar，然后类navbar-toggle包装在屏幕大于992px，隐藏-->         <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#navbar-collapse">           <!--这里的span.icon-bar 是用来在按钮中画三条线-->           <span class="icon-bar"></span>           <span class="icon-bar"></span>           <span class="icon-bar"></span>         </button>         <a class="navbar-brand" href="index.html" rel="external nofollow" rel="external nofollow" ><img src="img/logo.png" alt="Bootstrappin'" width="120"></a>         <!--这里的商标图一定要设置宽度-->       </div>       <!--这里的类collapse保证默认包裹的菜单是隐藏的，如果 替换为 in 则显示-->       <div class="navbar-collapse collapse" id="navbar-collapse">         <ul class="nav navbar-nav">           <li class="active"><a href="index.html" rel="external nofollow" rel="external nofollow" >             <span class="icon fa fa-home "></span> Home</a></li>           <li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" >             <span class="icon fa fa-desktop"></span> Portfolio</a></li>           <li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" >             <span class="icon fa fa-group "></span> Team</a></li>           <li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" >             <span class="icon fa fa-envelope "></span> Contact</a></li>         </ul>       </div><!--/.nav-collapse -->     </div><!--/.container -->   </nav> </header> 

//bootstrap.css @media (min-width: 992px) {  .navbar-toggle {   display: none;  } } 

//navbar.less  .navbar-toggle {  position: relative;  float: right;  margin-right: @navbar-padding-horizontal;  padding: 9px 10px;  .navbar-vertical-align(34px);  background-color: transparent;  border: 1px solid transparent;  border-radius: @border-radius-base;  // Bars  .icon-bar {   display: block;   width: 22px;   height: 2px;   border-radius: 1px;  }  .icon-bar + .icon-bar {   margin-top: 4px;  }  @media (min-width: @grid-float-breakpoint) { //@grid-float-breakpoint   display: none;  } } //variables.less @grid-float-breakpoint:   @screen-sm-min;  //想要改成992px这里就要用这个 @grid-float-breakpoint:   @screen-md-min; //-------- @screen-sm:         768px; @screen-sm-min:       @screen-sm; @screen-md:         992px; @screen-md-min:       @screen-md; @screen-desktop:       @screen-md-min; // Large screen / wide desktop // Note: Deprecated @screen-lg and @screen-lg-desktop as of v3.0.1 @screen-lg:         1200px; @screen-lg-min:       @screen-lg; @screen-lg-desktop:     @screen-lg-min; 

//__bootstrap.less //@import "navbar.less";  @import "_navbar.less"; //@import "variables.less"; @import "_variables.less";