Bootstrap输入框组件简单实现代码

Bootstrap输入框组件的学习代码，供大家参考，具体内容如下

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<div class="input-group">

<span class="input-group-addon">@

<input type="text" class="form-control" placeholder="Username">

<div class="input-group">
<input type="text" class="form-control" placeholder="Username">
<span class="input-group-addon">@