JSP页面中写了如下代码

<script id="userListTemplate" type="x-tmpl-mustache">
{{#userList}}
<tr role="row" class="user-name odd" data-id="{{id}}"><!--even -->
<td><a href="#" class="user-edit" data-id="{{id}}">{{username}}</a></td>
<td>{{showDeptName}}</td>
<td>{{mail}}</td>
<td>{{telephone}}</td>
<td>{{#bold}}{{showStatus}}{{/bold}}</td> <!-- 此处套用函数对status做特殊处理 -->
<td>
<div class="hidden-sm hidden-xs action-buttons">
<a class="green user-edit" href="#" data-id="{{id}}">
<i class="ace-icon fa fa-pencil bigger-100"></i>
</a>
<a class="red user-acl" href="#" data-id="{{id}}">
<i class="ace-icon fa fa-flag bigger-100"></i>
</a>
</div>
</td>
</tr>
{{/userList}}
</script>

双括号包裹是什么意思？