@RequestMapping("/faultType")
@ResponseBody
public Map<String,Object> faultType(int id,HttpServletRequest request)throws IOException
{
String ReturnMessage = "";
//獲取所有子類故障類型
List<FaultType> fauList=faultTypeService.getById(id);
if(fauList.size()>0){
request.setAttribute("childType", fauList);
ReturnMessage = "OK";
}else {
ReturnMessage = "未找到信息";
}


//*************************************************************
Map<String,Object> ReturnMAP = new HashMap<String,Object>();
ReturnMAP.put("childType", fauList);
return ReturnMAP;
}

<div class="col-sm-3">
<div class="form-group">
<label class="col-3 control-label no-padding-right">
故障類型： </label>
<select name="faulttype" id="faulttype" onchange="javascript:typeChange()">
<c:forEach items="${faultlist }" var="faulist">
<option value="${faulist.faultId }">${faulist.faultContent }</option>
</c:forEach>
</select>

</div>
</div>
<div class="col-sm-3">
<div class="form-group">
<label class="col-3 control-label no-padding-right">
故障： </label>
<input id="childTypeCont" name="childTypeCont"
value="" type="hidden" class="col-sm-4 form-control" placeholder="故障">

<select name="faulttype1" id="faulttype1"">
<option>--請選擇--</option>
<c:forEach items="${childType }" var="faulist">
<option value="${faulist.faultId }">${faulist.faultContent }</option>
</c:forEach>
</select>
</select>
</div>
</div>

function typeChange(){
var type=$("#faulttype").val();

var html = "<option>--請選擇--</option>"; 
var CommitUrl = "faultType.do?id=" + type;

$.ajax( {
type : "POST",
contentType : "application/json",
url : CommitUrl,
dataType : 'json',
success : function(result){
var Curedata = $.extend(true, [], result); 
if (Curedata.childType != null) { 
for(var i=0;i<Curedata.childType.length;i++){

html+="<option value='"+Curedata.childType[i].faultId+"'>"+Curedata.childType[i].faultContent+"</option>";
}
$("#faulttype1").empty();
$(html).appendTo("#faulttype1") ;

} }
});
}

var cc1  = $(".formcselect[@name='country'] option[@selected]").text();//得到下拉菜單的選中項的文本(注意中間有空格) 

var cc2 = $('.formcselect[@name="country"]').val(); //得到下拉菜單的選中項的值 

var cc3 = $('.formc select[@name="country"]').attr("id");//得到下拉菜單的選中項的ID屬性值 

$("#select").empty();//清空下拉框//$("#select").html(''); 

$("<optionvalueoptionvalue='1'>1111</option>").appendTo("#select")//添加下拉框的option 

$("input[@type=radio][@checked]").val(); //得到單選框的選中項的值(注意中間沒有空格) 

$("input[@type=radio][@value=2]").attr("checked",'checked');//設(shè)置單選框value=2的為選中狀態(tài).(注意中間沒有空格) 

$("input[@type=checkbox][@checked]").val(); //得到復(fù)選框的選中的第一項的值 

$("input[@type=checkbox][@checked]").each(function(){//由于復(fù)選框一般選中的是多個,所以可以循環(huán)輸出 

 alert($(this).val()); 

  }); 

$("#chk1").attr("checked",'');//不打勾 

$("#chk2").attr("checked",true);//打勾 

if($("#chk1").attr('checked')==undefined){} //判斷是否已經(jīng)打勾 

<script src="jquery-1.2.1.js"type="text/javascript"></script> 

<script language="javascript"type="text/javascript"> 

$(document).ready(function(){ 

$("#selectTest").change(function() 

{ 

   //alert("Hello"); 

   //alert($("#selectTest").attr("name")); 

  //$("a").attr("href","xx.html"); 

   //window.location.href="xx.html"; 

  //alert($("#selectTest").val()); 

   alert($("#selectTest option[@selected]").text()); 

   $("#selectTest").attr("value", "2"); 

}); 

}); 

</script> 

 <ahrefahref="#">aaass</a>