javascript - How to share a dojo widget to the child window which was created by window.open？ -

i created widget in parent window , create sub window using window.open. want display widget in sub window without using new.

we have tried use public variable pass it, when display it, there undefined error!

//the public variable remember widget create parent window common.testpage = null;  //the parent window this.wfrmstatistics = new dijit.layout.contentpane({     region : "center",     style : "width: 100%;height: 100%;" });  this.mainstack.addchild(this.wfrmstatistics); this.mainstack.selectchild(this.wfrmstatistics);  //new widget common.testpage = new gadd.wfrmstatistics({     style : "width:100%;height:100%;" }); this.wfrmstatistics.setcontent(common.testpage.domnode); common.testpage.startup();  //the sub window（actually same js file parent window）,create window.open this.wfrmstatistics = new dijit.layout.contentpane({     region : "center",     style : "width: 100%;height: 100%;" });  this.mainstack.addchild(this.wfrmstatistics); this.mainstack.selectchild(this.wfrmstatistics);  this.wfrmstatistics.setcontent(window.opener.common.testpage.domnode); //cause undefined error on web page 

i'm not sure if understand enough, assume mean have parent page dojo widget on it, , want access same widget instance on child page?

then indeed have define in global variable (because have attach window). example:

require([ "dijit/form/button" ], function(button) {     window.mybtn = new button({         label: "click me"     }, "mynode"); }); 

then should able access in child window using:

window.opener.mybtn; 

but must it's pretty ugly solution, don't think parent/child windows commonly used , global scope should avoided as possible well.