var joinData=function(){var datas=; for(var i=0;i<FR.checkBoxes.length;i++){var checkBox=FR.checkBoxes;if(checkBox.getValue()===true){var colRow=FR.cellStr2ColumnRow(checkBox.options.location);colRow.col++;var location=FR.columnRow2CellStr(colRow);var value=_g().getCellValue(location,null);datas=value;}}return datas.join("','");}var data=joinData();var url="http://localhost:8038/WebReport/ReportServer?reportlet=ylj/kf/YDZTKYJFZC.cpt&op=write"+"&ids="+data+'&sj='+aa+'&mon='+bb;window.onbeforeunload=null;window.open(url);如上所示,传递的参数包括ids,sj,mon,要实现post传参,这个js应该怎么修改