类似这样：

var w=800;//自己调整

var h=600;//自己调整

var url = encodeURI("/webroot/decision/view/report?viewlet=GettingStarted.cpt");

//窗体

var $iframe = $("<iframe id='inp' name='inp' width='100%' height='100%' scrolling='no' frameborder='0'>");

//将窗体的src属性设置为模板路径

$iframe.attr("src", url);

//窗体的属性

var o = {    

title: "我是对话框",  //标题   

 width: w,   //宽度    

  height: h //高度 

 };

//弹出窗体

FR.showDialog(o.title, o.width, o.height, $iframe, o);

$(".fr-core-panel-header.fr-core-panel-style-blue.fr-core-window-header").css('background','rgba(110,101,101,0.7)');//透明度

对话框背景透明-https://help.fanruan.com/finereport/doc-view-3907.html