这个有关二级联动的代码，怎么将它放入.js文件中。然后引用它啊。。
<script language= "javascript " type= "text/javascript ">
//城市------------------------------
function cityResult()
{
var city=document.getElementById( "DropDownList1 ");
AjaxMethod.GetCityList(city.value,get_city_Result_CallBack);
}

function get_city_Result_CallBack(response)
{
if (response.value != null)
{
document.all( "DropDownList2 ").length=0;
//document.all( "DropDownList2 ").options[0]=new Option( '请选择 ', ' ');
　　　　var ds = response.value;
if(ds != null && typeof(ds) == "object " && ds.Tables != null)
{
for(var i=0; i <ds.Tables[0].Rows.length; i++)
　　　　{
　　　　var name=ds.Tables[0].Rows[i].city;
　　　　　 var id=ds.Tables[0].Rows[i].cityID;
　　　　　　document.all( "DropDownList2 ").options.add(new Option(name,id));
　　　　}
}
}
return
}
//function areaResult()
//{
//var area=document.getElementById( "DropDownList2 ");
//AjaxMethod.GetAreaList(area.value,get_area_Result_CallBack);
//}
function getData()
{
var province=document.getElementById( "DropDownList1 ");
var pindex = province.selectedIndex;
var pValue = province.options[pindex].value;
var pText = province.options[pindex].text;

var city=document.getElementById( "DropDownList2 ");
var cindex = city.selectedIndex;
var cValue = city.options[cindex].value;
var cText = city.options[cindex].text;
}
</script>

[解决办法]
<script language=javascript src= "js1111.js "> </script>

onMouseOver = "cityResult() " ....