WinJS using alert() in your JavaScript
If you come from JavaScript world you will badly miss the alert() function. However, this habit can be entertained if you declare a function at default.js file. Then it will be accessible in all other pages which are navigated from default.html page.
function alert(message) {
var msgBox = new Windows.UI.Popups.MessageDialog(message);
msgBox.showAsync();
}
Then this code would work,
alert('Welcome back dear Alert');
Namoskar!!!