让Ext.util.MixedCollection 中的指定数据交换位置

 function changePlace(store,index,record,indicate){
                var keys=store.data.keys;
                var items=store.data.items;
                var tempKey;
                 if(indicate=="up"){
                     if(index>0){
                         items[index]=items[index-1];
                         items[index-1]=record;
                         tempKey=keys[index];
                         keys[index]=keys[index-1];
                         keys[index-1]=tempKey;
                         console.log(record);
                         console.log(items[index-1]);
                     }
                 }
                if(indicate=="down"){
                        if(index<store.getCount()-1){
                            items[index]=items[index+1];
                            items[index+1]=record;
                            tempKey=keys[index];
                            keys[index]=keys[index+1];
                            keys[index+1]=tempKey;
                        }
                }
            }

这样交换其实是有问题，无法让view得到刷新的效果，可以直接获取model进行交换

   ,moveRecords:function(indicate,rc){
        var me=this;
        var offsetIndex;
        var rc =rc||me.getCheckedRecords();
        if(indicate==="up"){
            var index=me.store.indexOf(rc[0]);
            offsetIndex=index>0?index-1:index;
        }else if(indicate==="down"){
            var index=me.store.indexOf(rc[0]);
            offsetIndex=index<me.store.getCount()-rc.length?index+1:index;
        }
        me.store.remove(rc);
        me.store.insert(offsetIndex,rc);     
    }

即通过indexof 查找记录，remove删除记录，然后insert指定位置插入记录，这样可以改变store从而使数据得到自动刷新，至于想要保存刷新前的样式，那可以再加方法实现！