easyUI的省市联动（用它封装好的方法会比较简单但是老是感觉有点局限性也许是我想多了）

<input id="cc1" class="easyui-combobox" data-options=" valueField: 'id', textField: 'province', url: '${pageContext.request.contextPath }/sys/province.action', 
onSelect: function(rec){ 
var url = '${pageContext.request.contextPath }/sys/city.action?id='+rec.id;
$('#cc2').combobox('clear');
$('#cc3').combobox('clear'); 
$('#cc4').combobox('clear');
$('#cc2').combobox('reload', url); 
}" />

<input id="cc2" class="easyui-combobox" data-options="valueField:'id',textField:'city',
onSelect: function(rec){ 
var url = '${pageContext.request.contextPath }/sys/area.action?id='+rec.id;
$('#cc3').combobox('clear');
$('#cc4').combobox('clear'); 
$('#cc3').combobox('reload', url); 

}"/>

<input id="cc3" class="easyui-combobox" data-options="valueField:'id',textField:'district',
onSelect: function(rec){ 
var url = '${pageContext.request.contextPath }/company/find.action?caddress='+rec.id;
$('#cc4').combobox('clear'); 
$('#cc4').combobox('reload', url); 

}"/>

<input id="cc4" name="companyid" class="easyui-combobox" data-options="valueField:'cid',textField:'cname'" />