1console.log("Hello World!");
2alert("Console has been updated.");

1console.log(a);             // write to the browser console
2document.write(a);          // write to the HTML
3alert(a);                   // output in an alert box
4confirm("Really?");         // yes/no dialog, returns true/false depending on user click
5prompt("Your age?","0");    // input dialog. Second argument is the initial value
6

1console.log("Who's Joe?")