我需要获取列表的所选类之间[和]之内li的数字，并将数字存储在变量中。我已经尝试了以下方法，但是缺少了一些东西。我不确定是否regex需要在括号之间查找并抓住字符串。
Java脚本
var assetID = $(".selected:contains('on-air-date').find('[]');
的HTML
<ul id="asset-list" class="expandable selectable normal" style="height: 671px;">
<li class="selected">
<div class="thumb">
<a href="/content/assets/750">
<img src="https://www.google.com/images/srpr/logo11w.png">
</a>
</div>
<div class="title">
<div>
<strong>Title of story</strong>
<br>
<span class="on-air-date">
On air: 10/28/14 05:30:00pm
[750]
</span>
<br>
<span class="blue radius label">Staging</span>
<span class="green radius label">Live</span>
</div>
</div>
</li>
<li>
<div class="thumb">
<a href="/content/assets/4200">
<img src="https://www.google.com/images/srpr/logo11w.png">
</a>
</div>
<div class="title">
<div>
<strong>Another story title</strong>
<br>
<span class="on-air-date">
On air: 12/10/14 02:09:18pm
[4200]
</span>
<br>
<span class="blue radius label">type label</span>
</div>
</div>
</li>
<li>
<div class="thumb">
<a href="/content/assets/4201">
<img src="https://www.google.com/images/srpr/logo11w.png">
</a>
</div>
<div class="title">
<div>
<strong>Yet another story title</strong>
<br>
<span class="on-air-date">
On air: 12/10/14 02:09:18pm
[4201]
</span>
<br>
<span class="blue radius label">type label</span>
</div>
</div>
</li>
</ul>
JSFiddle：链接
正则表达式可以帮助您获取数字，如下所示：
var num = $('.selected span.on-air-date').text().replace(/[^\[]*\[(\d+)\].*/,'$1');
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