grid中操作各种状态

//获得子表数据
function getChildGridData(grid){
if(!grid.isDirty()){
return null;
}
var records = grid.grid.getStore().getQueueRecords();
var result = {};
if(records.create){
result.create = records.create;
}
if(records.update){
result.update = records.update;
}
if(records.destroy){
result['delete'] = [];
for(var i = 0, size = records.destroy.length; i < size; i++){
result['delete'].push(records.destroy[i].id);
}
}
return Ext.util.JSON.encode(result);
}