http://www.51testing.com/html/19/n-807319-3.html
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div class="form-group">
<label for="exampleInputEmail1">帐号</label>
<i class="fa fa-envelope"></i>
<input type="email" name="email" class="form-control" id="email" >
</div>
<div class="form-group">
<label for="exampleInputPassword1">密码</label>
<i class="fa fa-lock"></i>
<input type="password" name="password" class="form-control" id="password" >
</div>
<div>
<button id="login_button" class="btn btn-primary" type="button">登 录</button>
</div>