如何在指定的DIV里面添加一个子页面

<header></header>
<nav></nav>
<div class="mui-content">
<div id="offCanvasWrapper" class="mui-off-canvas-wrap mui-draggable">
<aside></aside>
<div class="mui-inner-wrap">
<header></header>
<div id="pullrefresh" class="mui-content mui-scroll-wrapper">
怎么把这个 pullrefresh 当做一个 子页面加载
</div>
</div>
</div>
</div>