var joinData=function(){

var datas=[];

 for(var i=0;i<FR.checkBoxes.length;i++){

var checkBox=FR.checkBoxes[i];

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[datas.length]=value;

}

}

return datas.join(",");

}

var data=joinData();

var url="http://localhost:8075/WebReport/ReportServer?reportlet=doc/Advanced/PrintReport/SelectPrint_son.cpt&op=view"+"&ids="+data;

window.onbeforeunload=null;

window.open(url);

这个参数是怎么获取的啊？看不懂，请大神解答一下