comboBox通过DWR调用更新value
创建store

var store = [];

创建comboBox

var combo = new Ext.form.ComboBox({store: store,fieldLabel:'下拉框',//typeAhead: true,mode: 'local',id:'id',name: 'name',anchor:'100%',editable :true,triggerAction: 'all',selectOnFocus:true})

DWR调用获得store，并更新combo的value

DWREngine.setAsync(false);dwrClass.function(parameters,function(data){     store=data;});combo.store.loadData(store);//从传入的数据块中装载数据，并触发load事件。DWREngine.setAsync(false);