doc/node/fn.prev.html

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        <title>$.fn.prev</title>
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            document.write('<script src="' + $$path + '/mass_merge.js"><\/script>')
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        <article>
            <h3>$.fn.prev([ expr ])</h3>
            <p>
                <span class="stress">描述：</span>
            </p>
            <p>把匹配元素的与之毗邻的上一个元素节点收集起来，去重排序组成新mass实例返回。</p>
            <p>
                <span class="stress">参数：</span>
            </p>
            <dl>
                <dt>expr</dt>
                <dd>可选，String，用于进一步过滤的CSS选择器。</dd>
            </dl>
            <p>
                <span class="stress">返回值：</span>
            </p>
            <p>新mass实例</p>
            <fieldset>
                <legend>例子</legend>
                <p>将.third-item的上一个LI元素的背景变红。</p>
                <ul>
                    <li>list item 0</li>
                    <li>list item 1</li>
                    <li>list item 2</li>
                    <li class="third-item">list item 3</li>
                    <li>list item 4</li>
                    <li>list item 5</li>
                    <li>list item 6</li>
                </ul>
                <pre class="brush:xml;gutter:false;toolbar:false">

    <ul>
        <li>list item 0</li>
        <li>list item 1</li>
        <li>list item 2</li>
        <li class="third-item">list item 3</li>
        <li>list item 4</li>
        <li>list item 5</li>
        <li>list item 6</li>
    </ul>
    
</pre>
                <pre class="brush:javascript;gutter:false;toolbar:false">
$.require("ready,node", function() {
    $(".third-item").prev().css("background-color", "red");
});
</pre>
                <button class="doc_btn" type="button">点我，执行代码</button>
            </fieldset>
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