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代码编辑器：

<!DOCTYPE html>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://cdn.bootcss.com/foundation/5.5.3/css/foundation.min.css">
<script src="https://cdn.bootcss.com/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdn.bootcss.com/foundation/5.5.3/js/foundation.min.js"></script>
<script src="https://cdn.bootcss.com/foundation/5.5.3/js/vendor/modernizr.js"></script>
<form>
  <div class="row">
    <h2>前置后置标签</h2>
    <div class="large-6 columns">
      <div class="row collapse prefix-radius">
        <div class="small-3 columns">
          <span class="prefix">姓名</span>
        </div>
        <div class="small-9 columns">
          <input type="text" placeholder="请输入姓名...">
        </div>
      </div>
    </div>
    <div class="large-6 columns">
      <div class="row collapse prefix-radius">
        <div class="small-3 columns">
          <span class="prefix">宽度</span>
        </div>
        <div class="small-6 columns">
          <input type="text" placeholder="请输入宽度">
        </div>
        <div class="small-3 columns">
          <span class="postfix">px</span>
        </div>
      </div>
    </div>
  </div>
</form>

代码编辑器：

运行结果：