Miniui dynamically sets the value of the drop-down box

<input id="provice" emptyText='省份' class="mini-combobox" style="width:150px;" textField="text" valueField="id"
　　data="[{id:'1',text:'陕西'},{id:'2',text:'河南'}]"  onvaluechanged="valuechanged()"/>
<input id="city" emptyText='城市' class="mini-combobox" style="width:150px;" textField="text" valueField="id"
　　data="[{id:'1',text:'西安'}]" />

function valuechanged(){
    var provice= mini.get("provice").getValue();
    if ("2" == provice){
         mini.get("city").setData("[{id:'1',text:'洛阳'},{id:'2',text:'商丘'}]");
     } else {
                
     }
}