thymeleaf下拉框和多选框的修改是被选中

<select onchange="getChilds(this.value)" class="form-control select2" id="catId" name="catId">    
<option value=""> -- 请选择 -- </option>    
<option  th:selected="${goods.catId eq c.id}" th:each="c:${categoryList}"  th:value="${c.id}" th:text="${c.name}" value="1">蔬菜</option> 
</select>

---

   <input id="serveCity1" name="serveCity" value="北京"  type="checkbox" th:checked="${#strings.contains(supplierDirectory.serveCity,'北京')}" >北京
   <input id="serveCity2" name="serveCity" value="长沙"  type="checkbox" th:checked="${#strings.contains(supplierDirectory.serveCity,'长沙')}" >长沙