dhtmlx3.6 grid列头合并

mygrid.setHeader("序号,操作人员,发药,#cspan,审核,#cspan,数量小计,金额小计");
mygrid.attachHeader(["#rspan", "#rspan", "处方数量", "处方金额", "处方数量", "处方金额", "#rspan", "#rspan"]);