本文实例讲述了jQuery多级联动下拉插件chained用法。分享给大家供大家参考，具体如下：
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<title>Chained Select / Pulldown Demo</title>
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<p>
<h1>Chained</h1><br />
<small>Chained select plugin for jQuery</small>
<ul id="nav">
<li id="first"><a href="/" class="active">weblog</a></li>
<li><a href="/projects" class="last">projects</a></li>
<!--
<li><a href="/cv" class="last">cv</a></li>
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<div id="content">
<div class="entry">
<h3>jquery.chained.js</h3>
<form>
<select id="mark">
<option value="">--</option>
<option value="bmw">BMW</option>
<option value="audi">Audi</option>
</select>
<select id="series">
<option value="">--</option>
<option value="series-1" class="bmw">1 series</option>
<option value="series-3" class="bmw">3 series</option>
<option value="series-5" class="bmw">5 series</option>
<option value="a1" class="audi">A1</option>
<option value="a3" class="audi">A3</option>
<option value="s3" class="audi">S3</option>
</select>
<select id="model">
<option value="">--</option>
<option value="3-doors" class="series-1 bmw">3 doors</option>
<option value="5-doors" class="series-1">5 doors</option>
<option value="coupe" class="series-1 series-3 series-6">Coupe</option>
<option value="cabrio" class="series-1 series-3 series-6">Cabrio</option>
<option value="sedan" class="series-3 series-5 series-7">Sedan</option>
<option value="touring" class="series-3 series-5">Touring</option>
<option value="sedan" class="a1 a3 s3">Sedan</option>
<option value="sportback" class="a3">Sportback</option>
<option value="cabriolet" class="a3">Cabriolet</option>
<option value="avant" class="a1">Avant</option>
<option value="allroad" class="a3">Allroad</option>
