window.open("?年月="+ym)
"?年月="+ym+"&省份="+sf
后面在继续拼接即可
var ym=this.options.form.getWidgetByName("ym").getValue();
var URL="/webroot/decision/view/report?viewlet=xxx.cpt&年月="+ym;
window.open(encodeURI(encodeURI(URL)));