select 下拉框获取多值

select下拉框选中，获取选中option的多个属性值

<label class="col-sm-3 control-label is-required">试卷名称：</label>
<div class="col-sm-8" >
    <input type="hidden" id="paperName" name="paperName"/>
    <input type="hidden" id="paperDuration" name="paperDuration"/>
    <select id="paperId" name="paperId" class="form-control m-b">
        <option value="">请选择</option>
        <option th:each="paper:${papers}" th:value="${paper.paperId}" th:paperTime="${paper.examTotalTime}" th:text="${paper.paperName}"></option>
    </select>
</div>      

var paperName = $("#paperId option:selected").text();
var paperTime = $("#paperId option:selected").attr("paperTime");