bootstrap基础学习十一篇

bootstrap下拉菜单（Dropdowns）

下拉菜单是可切换的，是以列表格式显示链接的上下文菜单。如需使用下列菜单，只需要在 class .dropdown 内加上下拉菜单即可。

a.代码示例如下：

<!DOCTYPE html>

<html>

<head>

   <meta charset="utf-8"/>

   <title>Bootstrap 实例 - 下拉菜单（Dropdowns）</title>

   <link href="http://libs.baidu.com/bootstrap/3.0.3/css/bootstrap.min.css" rel="stylesheet">

    <script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>

   <script src="http://libs.baidu.com/bootstrap/3.0.3/js/bootstrap.min.js"></script>

</head>

<body>

<div class="dropdown">

   <button type="button" class="btn btn-md dropdown-toggle" id="dropdownMenu1"

      data-toggle="dropdown">

      主题

      <span class="caret"></span>

   </button>

   <ul class="dropdown-menu" role="menu" aria-labelledby="dropdownMenu1">

      <li role="presentation">

         <a role="menuitem" tabindex="-1" href="#">Java</a>

      </li>

      <li role="presentation">

         <a role="menuitem" tabindex="-1" href="#">数据挖掘</a>

      </li>

      <li role="presentation">

         <a role="menuitem" tabindex="-1" href="#">

            数据通信/网络

         </a>

      </li>

      <li role="presentation" class="divider"></li>

      <li role="presentation">

         <a role="menuitem" tabindex="-1" href="#">分离的链接</a>

      </li>

   </ul>

</div>

</body>

</html>

b.效果如图：

aaarticlea/png;base64,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" alt="" />

c.对齐

通过向 .dropdown-menu 添加 class .pull-right 来向右对齐下拉菜单。

如：

 <ul class="dropdown-menu pull-right" role="menu"

      aria-labelledby="dropdownMenu1">

d.标题

可以使用 class dropdown-header 向下拉菜单的标签区域添加标题

如：

 <li role="presentation" class="dropdown-header">下拉菜单标题</li>

效果如：aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAALgAAADOCAIAAAACKl9MAAAOzklEQVR4nO2dvVLbTBfHfU9unttgxlVugkZ1ylRUcUWRGSpTa3wBnhSUFC4VDErABGMsY/kDA4pfvcVKq/2SfPyF1+L/G2YekFZrPTo/nz1SpFUljuPFYjGbzcIwHB0U4/F4NpstFosY7J7KYrE4OEVEwjCEKx9AZTab7TvWmzKbzfZ9GMtPZTwe7zvQmzKZTPZ9GMtPZd9R3g77PozlB6IAEhAFkIAogAREASQgCiABUQCJtUU5P64en5tXXZwcVUWOT5QFbGnO1mux78NYftbPKBcnRznBFtdIrQrk2pB9H8bys8nQkxd3LaOcj86PlXxydHKxwSdr7Pswlh+yKGr0jbDwGzKK7NTFyRFEOTA2G3rM4TZnlOPz0ej8uHp0cgFRDpBdiGIgE+X43JhRvn//rieo79+/E3dm34ex/GxfFK0cqVaPTk6WiaK7QrcEonwAK4hiMEBBLm1FHc6Pq8fnFydH1QJRRqPRt2/fWE8/fvyg7xhE+QB2MvScHyeViCDQxclRtXp0cnF+XHzK8+3bt1UtGUGU3bOrYvb4PMsbzBgh3SQ17RbZ92EsPzsQ5fy4enR0tIurJfns+zCWH6ooywuUdJTJLpkUb4NL+AcF/lEQkIAogAREASQgCiABUQCJJaI8Hwj/+8R8qCj7DvSm7DtYNrJlUcbj8b6jvCnj8XjfQbGdLYgynU7Fgz48QCaTyQKk7EiXyr9///L8CA6B4XD4/v7+73OzkjRrirJYLKIomkwmihkD6xkOh2EYvr29RSCKCtTZiiuVxWLBulY++B0cFEZvCnRZWRSuCP/IN4FXYD1ivBRvFF02caUSRdF8Pu92u51OxwOloNPp3N/fz+dzXZe1XanM5/Pr6+sgCKIoWjEbAUuJoigIgk6n8/LywrJLniv0PivdbjcIgt3tNNgXQRB0u102HvHUsrYrlaurK+SSUhJFUafTYUVMQV4h9lbxPG+nuwv2iOd58/lccWW9pLKOKNF//+Gn+Gf1mO4Ez/NeXl6WukLpak1RVt/nT4Q9x8fzvOl0yl2BKHZhz/HxPG8ymcxms5eXl4KkQukKomwfe46P53nj8Xg6nc5msw2TCkTZPvYcH8/zwjBkrhiTCkTZJ/YcH8/z2P06PKlAFIuw5/h4nsf+jZ1VKgWjz9KuNhXlsnm6hOZlHMex32o0Wj7fzG81khUal82sofi7+JHypoYFyWb63rEV0vJmq9UwtloX20QZjUbK6LMHUWS0kHEUUVhbofFy4YTNxU0vm3pYjX6ZG/ithtBTzs6viFWiBEHw/PwchuEBiCJK0Gio397TU3mbwozia19+uRdpfb4tcka5VDXd0BerRBkMBkwUPvrwMsU6UeLYlFEM2+aT9iokALlL8ZMpnyVnFFFI8SPWwypRnp6elDLFWM8u7WrrojQaDdNXOQueGl9jiITlapPlMl02G41G47TRbJoaN1q+IaMkS5uX5RRllL6CUa9niSc+2xel5futhpb30wiz1cL3WWpn+FtOUYSMctlsNpunzculRbG030yURssvoShBEFgoSnKQRVmS7y+PFQ+FEGpiMbs0o/itZsvPvEh26LLZaPk8Namf1Wi1yitKv9/nokynU+tEiWP5K2/6+ufUEn6r0Wy1Go1mszhixs0vWzziQguugJSfRJ8ykUopCr/sxk58LBNFRI7qZVMegoTtT9No8VpCGKdIWYcbIA5HPJcka8RKJf290brMv7yzAhAlYTtnPao6fPRQVyaCaB3nn9zII00s5A62TfJhzUyfUy3dbQBESVjzOgorFooyQcbyM9yloqRthAJGXl1QFm1mCkRJsOdA2Ik9xweiWI09xweiWI09xweiWI09xweiWI09xweiWI09x2f/ouCn+GfdyG6ZPYsCDgWIAkhAFEACogASEAWQgCiABEQBJKwUxT/7Uv1y5m+nM7AVIAogYb0o/tkX4TWTX3/GcRz//Jr+Fst/mhqDrWC5KJISP7+m0dcWm5dCle1huSgymQmCE0p6MTQGW+AgRPn5VRtPzGkkpzHYHMtFSaKeWCNKkfyuLjI3BhtjkSg/v6Yx5qJki9IWSmlydvZF9CS3MdgUi0SR8oheyyZnNJkLyQK9qDU1BhtikSjC2W0WYKHiUAaapLmYNIoag82wShRgLxAFkIAogAREASQgCiABUQAJiAJIQBRAAqIAEhAFkIAogAREASQgCiABUQCJzyBKu16rOq60yHXUJaAYm0Rp12u1ejvOwqj+N7e1EbY2NoqS06fwgTl8Wr1sEiVOI+U6VcfNItmu1wzx0bQyr40FUdr1WrFTgih8a6lPiGKBKMYwOq62vFZ3xSWOU5BRpG2dujHSzCkxieR2iYxigygJLGJZQIRvt5gm1s0ozDy2AetaaGrMKJ86kXDsEsV1qtVqrV53hJTg1LQ4xnGcI4oxqPJC16k6brvN1ROKGUWURJd0c/N49FmwSBTXSRMJi1cybDiu63AjhEglq7lW+aVHu16rOo5Tq7eN2UfolmWzWr2elkoQJcUiURiGnJDkjixQaT1Byijctzh2HaeuFkJp67RP4TRLP/eBKDaIYjgnFVJCrVaT45QOPe16zZxVHDdZ6ebVsFrkE+dk3ZBR4tgqUZQASXFxHS2oqSjpubS8ujjNuI75BCbZipUxaQ2Ubf6ZL9PZJErbddvC+axUf+rnptKAtIIo7Xott60r1CYQRcImUeKYO8GuZCQiJMlEGSukUcV0KdUkim6JdCbtOuxii3YJRu/0s2GRKJkSKXoZwQKdXnBz6sIpcmFGyYodrczILq5Uq1W9FFL2EKLsX5SdkGaoJL7GNPGJS1Q6ZRcFbAmIAkhAFEACogASEAWQgCiABEQBJCAKIAFRAAmIAkhAFEACogASEAWQsEmUnTwpKN1jUNQwQb+Du/gfl3N7NfZvvsnyELBJlHg3Twpmd/ezv8SbLU13zdYcpyD2vL1/9uXLmb802NItMOrzJgd0w4NFouziSUHeM3+GrJ3dh2189pgaq8QT8SZ/tYN2vSbcW5UJ7zp8r+XGFntikygJ239SUO453yjhluu8ptkH/fzK3sjAMkp2V3bNcaR7bcVbb9PHFWt1ly1ti7dd2j0I2SXK1p8UVJ/WER8Jc7VuajVyzZB6Ij7M4Tj8aQ92c3aSD7M7fg2JjC23OZcwLBJlZ08KLpvMInnqg93MXzztQRpk7okyVYJwD3d2S7iYBR3BCP4/mH6czTnFIlEYW39S0PTouSmjxHHOKGYg8yTrShoys4pDqapNQ56w7/bKYpEou3hSMO14eUaRWuY1TVoKnqSisHSYqpgMY0n5IZzFCxqYPsLiEcgiUXb2pOAaGaXwYfb0hCfb5zpPIEKloxSzKtpH2P3Iqk2i7OhJQXFwEEXhz6srU2Iom4td1uptxZOsVGpLu8V/5ydB6v8JRNmIbT8p6DrV5AoaZfCnDD2yJ/QLbhh6Umx8UjA9YcovUKSkQht6JPJEET7P7BEyCigjEAWQgCiABEQBJCAKIAFRAAmIAkhAFEACogASEAWQgCiABEQBJCAKIAFRAAmIAkhAFEBiy6Lcg5KCjAJIQBRAAqIAEhAFkIAogAREASQgCiABUQAJiAJIQBRAAqIAEhAFkIAogAREASQgCiABUQAJW0Xh0w/JM9mb0Wdm0tdTZjfK2slbGFob5vCj7OnhYqUo8rzwegAIb7QQ58QyepIznZY4Q6BxZvVsF0zLymuKfaKYZwrNyRj6BID63JGaO5pnyjzHfJZB0/y1hpnRzVg8H9s62CWKOnOiusr8rpss8JRpZNXvvRDyPBfl5ZJn2VS34p6WTJI4tkoUwhgvTBzJ32oh6pNklAJRtAmw0xZi+IW9yNYat9L+LO3wY5EocRwXzvJZ8L02UDQxtZQBkgTgOsIkwW76Mp28UcqkV7nHHttESTCMD4UHPjfdm2oUuT/TZOixmjLyxh95du1SppIES0VRA6+JUjy/cPaFzn95hjSXviJU+p4dV08YWYHL59XOoVza2CmKliC0oV9642BWHgjzVC8TRe9pxYxinP6+rLWslaIYsri2qODVKtK7fZaKor7Rw3FZuUIWJctF/G0s2zgItmGbKOZLJvq1lSWvYBJFKR4PtLe9SEVs7mcUnTSXMaFYJYr61gQxWxiul+cEUX4vijmjSPrIBan+MiY1X7mZRGY72gfymsCVsEkUYDEQBZCAKIAERAEkIAogAVEACYgCSHBRRqMRE2U+n0MUoOJ53tPTExdlNptBFGCAiTIcDrcjShRFH7Pf4COJoujXr19MlDAMJ5MJE+Xt7U0XZWlvFd/3gyD4gP0GH0wQBL7vDwaD5+dnoyiLxWIFUR4fH6+uroIgQF4pDVEUBUFwdXXV6/XYKU8YhvyUh4nC0skKojw9PfV6vZubm1+/fnmgFFxdXfm+//DwIBYooih83FlBlMFg0O/3e73e379/u93u7e3tnz9/fN+/ubm5vr6+vr7udDqdTucKWAaLC4vRzc2N7/t//vy5vb3tdrt///7t9Xr9fn8wGCgFilLJriBKEARPT0+Pj48PDw+iK79///Z9nxnDpQH2wOLCYvT792/RkoeHh8fHR3ZizC+1FVSyJFGen58VV+7v7+/u7m5vb7kxDB9YAw8K8+P29vbu7u7+/l63JAxDZdxZU5TRaDQcDrkrvV6P69Ltdu/u7rg0wDZYdLrdLlek1+txS8TqpHjcIYkShqHoSr/fF3VhxgBrYTHiivT7fdESXp0Y0wm9QInjuDKZTJgrbAwaDAZcF2YM5wFYgxgXFimmyGAwYCMOt4QNOhumkziOK9PpdDKZjMfjMAyfn5+HwyHLLswYRh9YCQ8Q84PFjtcliiV56YQqysvLy2w2m06n4/GY6cKyiygNsBYuB88iLI6sLqFYQhVlPp9zV8TswhilPAPL4KHhweJZpMCS9dJJHMeV19fX19dXrotoDJMGWA6LFPdDVES0ZJN0Esdx5f39/e3tjevCjOHSiOoA2xBjxKLGIigqUpBL6JbEcVyJooh19/b2xo3h0nBegGUoAeKBY3HkihRYspIo/we606zCu29mKAAAAABJRU5ErkJggg==" alt="" />

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