bootstrap在input框中加⼊icon图标
<form class="form-horizontal">
<div class="form-group has-feedback">
<div class="username">
<span class="fa fa-user-circle-o fa-2x form-control-feedback"></span>
<input type="text" class="form-control" id="inputPassword" placeholder="⽤户名">
</div>
</div>
<div class="form-group pwd-top has-feedback">
<div class="password">
<span class="fa fa-unlock-alt fa-2x form-control-feedback"></span>
<input type="password" class="form-control" id="inputPassword" placeholder="密码">
</div>
</div>
<div class="form-group">
<div class="checkbox  col-sm-4 col-md-4 col-lg-4">
<label>
<input type="checkbox"> 记住密码
</label>
</div>
<label for="" class="col-sm-4 col-md-4 col-lg-4 control-label forget-pass"><a href="">忘记密码</a></label>
<label for="" class="col-sm-4 col-md-4 col-lg-4 control-label register"><a href="">注册</a></label>
</div>
<div class="form-group">
<button class="btn btn-login" type="submit">登 ；录</button>
</div>
</form>
实际效果icon图标库
对css样式进⾏修改，才能使icon图标垂直居中，然后居左
下⾯的line-height: 50px，因为我的input框是50px⾼
然后这利的left:20px 如果你不给，icon图标就是靠右对齐
/*padding-left:60px  因为图标是有⼀个宽度，然后图标有⼀个left:20px  图标的宽度34px，估计⼀下设置差不多60px，刚好让⽂字不被图标遮挡*/ .form-center .username input,.form-center .password input{
height: 50px;
padding-left: 60px;
}
.form-control-feedback {
line-height: 50px;
left: 20px;
}