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<select multiple="multiple"> <optgroup label="On-line2"> <option>A</option> <option>B</option> <option>C</option> </optgroup> <optgroup label="On-line2"> <option>hha</option> <option>sa</option> <option>ds</option> </optgroup> </select>
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原文地址:http://www.cnblogs.com/wangmengfei/p/4563023.html