EXtjs4
我不能理解这段代码，谁能理解，麻烦帮一下忙
Ext.define('com.ritetone.core.position.store.SiteStore', {
  extend: 'Ext.data.Store',
  requires:['Ext.ux.data.DwrProxy'],
  funName:Ext.emptyFn,
  proxy: {
  type: 'dwr',
  /*DWR method that will return data.*/
  dwrFunction:dwrPositionService.findSiteByCriteria,
  /** Function that returns parameters for remote
  * DWR Method for each request.
  */
  getDwrArgs: function(operation, store) {
  var argObj = Ext.apply({}, operation.params);
// argObj.start =this.baseParams.start;
// argObj.limit = this.baseParams.limit;
  argObj=this.extraParams.siteCriteria;
  argObj.firstResult =operation.start;
  argObj.fetchSize = operation.limit;
  argObj.maximumResultSize = operation.limit;
  /**
  * If server side method takes several parameters
  * then array must be returned.
  */
  return argObj;
  },
  reader: {
  root: 'list',
  totalProperty:'total'
  }
  }
});

------解决方案--------------------
扩展ext的组件,拉数据转成JSON格式,应用到gridPanel中,带分页..