如果是，如何使下拉列表显示为滚动框而不是页面滚动？
代码如下:
<！ DOCTYPE html>
<元字符集=“ utf-8”>
<元内容=“宽度=设备宽度bootstrap下拉菜单样式，初始比例= 1”>
</ title></p>
<p><！-Bootstrap-></p>
<p><link href =“ css / bootstrap.min.css”></p>
<p><link href =“ css / index.css”></p>
<p><！-HTML5 shim和Respond.js用于IE8支持HTML5元素和媒体查询-></p>
<p><！-警告: 如果您通过文件查看页面<strong>bootstrap下拉菜单样式</strong>，则Respond.js不起作用: //-></p>
<p><！-[如果是IE 9]></p>
<p><img src='http://www.51qianduan.com/uploadfile/article/1807/20/5536.png' alt='bootstrap 下拉菜单树_bootstrap下拉菜单样式_bootstrap 分页样式'/></p>
<p><script src =“</p>
<p><script src =“</p>
<p><！ [endif]-></p>
<p></ head></p>
<p><body></p>
<p><div></p>
<p><div></p>
<p><div></p>
<p><div></p>
<p><button type =“ button” data-toggle =“ dropdown” aria-expanded =“ true”></p>
<p><a href='/a/jisuanjixue/article-132663-1.html' title='类别' target='_blank'>类别</a></p>
<p><span> </ span></p>
<p></ button></p>
<p><ul角色=“菜单” aria-labelledby =“ dropdownMenu1”></p>
<p><li角色=“ presentation”><a角色="menuitem"tabindex="-1"href="#">类别1 </a> </ li></p>
<p><img src='http://www.html5tricks.com/wp-content/uploads/2016/12/jquery-bootstrap-accordion-drop-menu.png' alt='bootstrap 分页样式_bootstrap 下拉菜单树_bootstrap下拉菜单样式'/></p>
<p><li角色=“ presentation”><a角色="menuitem"tabindex="-1"href="#">类别2 </a> </ li></p>
<p><li角色=“ presentation”><a角色="menuitem"tabindex="-1"href="#">类别3 </a> </ li></p>
<p><li角色=“ presentation”><a角色="menuitem"tabindex="-1"href="#">类别4 </a> </ li></p>
<p><li角色=“ presentation”><a角色="menuitem"tabindex="-1"href="#">类别1 </a> </ li></p>
<p><li角色=“ presentation”><a角色="menuitem"tabindex="-1"href="#">类别2 </a> </ li></p>
<p><li角色=“ presentation”><a角色="menuitem"tabindex="-1"href="#">类别3 </a> </ li></p>
<p><li角色=“ presentation”><a角色="menuitem"tabindex="-1"href="#">类别4 </a> </ li></p>
<p><li角色=“ presentation”><a角色="menuitem"tabindex="-1"href="#">类别1 </a> </ li></p>
<p><li角色=“ presentation”><a角色="menuitem"tabindex="-1"href="#">类别2 </a> </ li></p>
<p><li角色=“ presentation”><a角色="menuitem"tabindex="-1"href="#">类别3 </a> </ li></p>
<p><li角色=“ presentation”><a角色="menuitem"tabindex="-1"href="#">类别4 </a> </ li></p>
<p><li角色=“ presentation”><a角色="menuitem"tabindex="-1"href="#">类别1 </a> </ li></p>
<p><li角色=“ presentation”><a角色="menuitem"tabindex="-1"href="#">类别2 </a> </ li></p>
<p><li角色=“ presentation”><a角色="menuitem"tabindex="-1"href="#">类别3 </a> </ li></p>
<p><li角色=“ presentation”><a角色="menuitem"tabindex="-1"href="#">类别4 </a> </ li></p>
<p><img src='http://i.serengeseba.com/uploads/i_0_3382416308x2923462322_26.jpg' alt='bootstrap下拉菜单样式_bootstrap 分页样式_bootstrap 下拉菜单树'/></p>
<p><li角色=“ presentation”><a角色="menuitem"tabindex="-1"href="#">类别1 </a> </ li></p>
<p><li角色=“ presentation”><a角色="menuitem"tabindex="-1"href="#">类别2 </a> </ li></p>
<p><li角色=“ presentation”><a角色="menuitem"tabindex="-1"href="#">类别3 </a> </ li></p>
<p><li角色=“ presentation”><a角色="menuitem"tabindex="-1"href="#">类别4 </a> </ li></p>
<p><li角色=“ presentation”><a角色="menuitem"tabindex="-1"href="#">类别1 </a> </ li></p>
<p><li角色=“ presentation”><a角色="menuitem"tabindex="-1"href="#">类别2 </a> </ li></p>
<p><li角色=“ presentation”><a角色="menuitem"tabindex="-1"href="#">类别3 </a> </ li></p>
<p><li角色=“ presentation”><a角色="menuitem"tabindex="-1"href="#">类别4 </a> </ li></p>
<p><li角色=“ presentation”><a角色="menuitem"tabindex="-1"href="#">类别1 </a> </ li></p>
<p><li角色=“ presentation”><a角色="menuitem"tabindex="-1"href="#">类别2 </a> </ li></p>
<p><li角色=“ presentation”><a角色="menuitem"tabindex="-1"href="#">类别3 </a> </ li></p>
<p><li角色=“ presentation”><a角色="menuitem"tabindex="-1"href="#">类别4 </a> </ li></p>
<p><li角色=“ presentation”><a角色="menuitem"tabindex="-1"href="#">类别1 </a> </ li></p>
<p><li角色=“ presentation”><a角色="menuitem"tabindex="-1"href="#">类别2 </a> </ li></p>
<p><li角色=“ presentation”><a角色="menuitem"tabindex="-1"href="#">类别3 </a> </ li></p>
<p><img src='http://img.qqzhi.com/upload/img_1_2813140754D996839789_27.jpg' alt='bootstrap 下拉菜单树_bootstrap下拉菜单样式_bootstrap 分页样式'/></p>
<p><li角色=“ presentation”><a角色="menuitem"tabindex="-1"href="#">类别4 </a> </ li></p>
<p></ ul></p>
<p></ div></p>
<p></ div></p>
<p></ div></p>
<p><！ --------------------------------------------- ----></p>
<p><div></p>
<p><div></p>
<p><button type =“ button”><a href='/a/bofangqi/article-134506-1.html' title='加载' target='_blank'>加载</a>更多... </ button></p>
<p></ div></p>
<p></ div></p>
<p></ div></p>
<p><！-jQuery（Bootstrap的JavaScript插件必需）-></p>
<p><script src =“</p>
<p><！--包括所有已编译的插件（如下），或根据需要包括单个文件-></p>
<p><script src =“ js / bootstrap.min.js”> </脚本></p>
<p></ body></p>
<p></ html></p>
<p><br />本文来自<a rel="home" href="https://www.pc-fly.com/" target="_blank">电脑杂谈</a>，转载请注明本文网址：<br />https://www.pc-fly.com/a/ruanjian/article-147879-1.html</p>
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