$("#m-s-type").on("change",function(){ var id = $(this).find("option:selected").attr("data-id"); console.log(id) if(id==1){ } })
<select class="form-control knowledgeTypes" name="resourceTypes" id="m-s-type"> <option th:data-id="${1}">音频</option> <option th:data-id="${2}">图像</option> <option th:data-id="${3}">文本</option> <option th:data-id="${4}">视频</option> </select>