<div class="container">
  <form action="#" method="post">
    <fieldset>
      <legend>用户登陆</legend>
      <div class="form-group">
        <label>用户名：</label>
        <input type="text" class="form-control" name="name" placeholder="用户名">
      </div>
      <div class="form-group">
        <label>密码：</label>
        <input type="password" class="form-control" name="pwd" placeholder="密码">
        <!--form-control代表的是占满容器-->
      </div>
      <div class="checkbox">
        <label><input type="checkbox">记住密码</label>
      </div>
      <!--多选框必须这么写 不然会造成选框与文本重叠的问题-->
      <div class="form-group">
        <button type="submit" class="btn btn-default">提交</button>
      </div>
    </fieldset>
  </form>
</div>

<div class="container">
  <form action="#" method="post" class="form-inline">
    <!--form-inline让表单横向放置-->
    <fieldset>
      <legend>用户登陆</legend>
      <div class="form-group">
        <label class="sr-only">用户名：</label>
        <!--sr-only让label隐藏-->
        <input type="text" class="form-control" name="name" placeholder="用户名">
      </div>
      <div class="form-group">
        <label>密码：</label>
        <input type="password" class="form-control" name="pwd" placeholder="密码">
        <!--form-control代表的是占满容器-->
      </div>
      <div class="checkbox">
        <label><input type="checkbox">记住密码</label>
      </div>
      <!--多选框必须这么写 不然会造成选框与文本重叠的问题-->
      <div class="form-group">
        <button type="submit" class="btn btn-default">提交</button>
      </div>
    </fieldset>
  </form>
</div>

<div class="container">
  <form action="#" method="post" class="form-horizontal">
    <!--form-horizontal让表单初始化-->
    <fieldset>
      <legend>用户登陆</legend>
      <div class="form-group">
        <label class="col-xs-3 control-label">用户名：</label>
        <!--借助栅格系统设置label的宽度-->
        <div class="col-xs-9">
          <input type="text" class="form-control" name="name" placeholder="用户名">
        </div>
        <!--用div设置栅格并包裹input-->
      </div>
  </form>
</div>
<!--注意！把label和input放在同一行在768分辨率一下是有问题的 在md和lg上正常-->

<div class="container">
  <form action="#" method="post" class="form-horizontal">
    <!--form-horizontal让表单初始化-->
    <fieldset>
      <legend>用户登陆</legend>
      <div class="form-group has-feedback has-success">
        <!--在项目的div外包围class加has-feedback-->
        <label class="col-xs-3 control-label">用户名：</label>
        <div class="col-xs-9">
          <input type="text" class="form-control" name="name" placeholder="用户名">
          <span class="glyphicon glyphicon-ok form-control-feedback" aria-hidden="true"></span>
          <!--在input之下添加一个span 记得加form-c-f-->
        </div>
      </div>
  </form>
</div>

<div class="container">
  <div class="btn-toolbar">
    <div class="btn-group">
      <button class="btn btn-success"><span class="glyphicon glyphicon-star"></span></button>
      <button class="btn btn-info"><span class="glyphicon glyphicon-star"></span></button>
      <button class="btn btn-danger"><span class="glyphicon glyphicon-star"></span></button>
      <button class="btn btn-default"><span class="glyphicon glyphicon-star"></span></button>
    </div>
  </div>
</div>

<div class="col-md-4 col-md-offset-2">
  <div class="input-group input-lg">
    <div class="input-group-addon">
      <a href=""><span class="glyphicon glyphicon-star"></span></a>
    </div>
      <input type="text" class="form-control input-xs">
    </div>
  </div>
</div>