Edit in JSFiddle

<!doctype html>
<html>
     <head>
           <script src="https://sapui5.netweaver.ondemand.com/sdk/resources/sap-ui-core.js"
                   data-sap-ui-libs="sap.m"
                   data-sap-ui-theme="sap_bluecrystal">
         </script>
    </head>
    <body>
        <div id="content"></div>
    </body>
</html>
var oApp = new sap.m.App();

var oPage1 = new sap.m.Page("page1Id",{
				title: "Hi this is first page",
    			content: [ new sap.m.Button({ text: "Go to 2nd Page" , press: function(){ 
                	
                    oApp.to("page2Id");
                    
                }}) ]
			});

oApp.addPage(oPage1);

var oPage2 = new sap.m.Page("page2Id",{
				title: "This is second page",
    			showNavButton: true,
    			navButtonPress: function(){
               		oApp.back();
                }
			});

oApp.addPage(oPage2);

oApp.placeAt("content");