你要参数也写进去，不然就是默认的，或者没有默认值，就是空数据

类似

var DIQU = this.options.form.getWidgetByName("Diqu").getValue();
var RIQI = this.options.form.getWidgetByName("Riqi").getValue();
var name = DIQU + "_地区_" + RIQI;
var REPORT_URL = '${servletURL}?viewlet=doc/JS/自定义导出文件名称2.cpt&Diqu=' + DIQU + '&Riqi=' + RIQI + '&format=excel' + '&__filename__=' + name;
window.location = (FR.cjkEncode(REPORT_URL));

var a=this.options.form.getWidgetByName("控件名称1").getValue();

var b=this.options.form.getWidgetByName("控件名称2").getValue();

var c=this.options.form.getWidgetByName("控件名称3").getValue();

var d=this.options.form.getWidgetByName("控件名称4").getValue();

var name=b+c+'-'+d+a;

window.open("http://localhost:8075/webroot/decision/view/report?viewlet=AR%2Bstament.cpt&op=write&format=excel&extype=simple&__filename__="+name);

//如需传参

//window.open("http://localhost:8075/webroot/decision/view/report?viewlet=AR%2Bstament.cpt&op=write&format=excel&extype=simple&__filename__="+name+"&参数="+参数1+"&参数2="+"参数2");