app.js

<a href="#" onclick="openInDialog(500,600,true,true,false,'http://www.google.com');">Google</a>
<a href="#" onclick="openInDialog(500,600,true,true,false,'http://server/sites/demo/Lists/News/NewForm.aspx?RootFolder=&IsDlg=1');">New Element</a>

Fuente:
https://alinimer.wordpress.com/2013/02/25/open-pages-and-forms-in-modal-dialog-for-sharepoint-2013/

SP15ModalDialog.js

//function to open pages in a dialog
function openInDialog(dlgWidth, dlgHeight, dlgAllowMaximize,dlgShowClose,needCallbackFunction, pageUrl) 
{    
    var options = { url: pageUrl, width: dlgWidth, height: dlgHeight, allowMaximize: dlgAllowMaximize,
        showClose: dlgShowClose		
		};
		
	if(needCallbackFunction)
	{
		options.dialogReturnValueCallback = Function.createDelegate(null, CloseDialogCallback);
	}
    SP.SOD.execute('sp.ui.dialog.js', 'SP.UI.ModalDialog.showModalDialog', options);
}

function CloseDialogCallback(dialogResult, returnValue)
{
	//if user click on OK or Save
     if(dialogResult == SP.UI.DialogResult.OK)
     {  // refresh parent page
 		SP.SOD.execute('sp.ui.dialog.js', 'SP.UI.ModalDialog.RefreshPage', SP.UI.DialogResult.OK); 	 		
     }
     // if user click on Close or Cancel
     else if(dialogResult == SP.UI.DialogResult.cancel)
     {	// Do Nothing or add any logic you want 
     }
     else
     {//alert("else " + dialogResult);
     }
}

Hello, thank you for solution.
I have an issue now:
after the OK action there is no refresh of parent page... What reason can this be? I'm inserting script to WebPart "Script Editor" on Wiki Page of SP2013