js改成
var a = this.options.form.getWidgetByName("start_date").getValue();
var b = this.options.form.getWidgetByName("end_date").getValue();
var name = a +"_单据_"+ b;
var REPORT_URL = '${servletURL}?viewlet=自定义导出1109.cpt&start_date=' + a + '&end_date=' + b + '&format=excel&__filename__=' + name;
window.location = (FR.cjkEncode(REPORT_URL));