Blackjack - The Essential Guide to HTML5 - page 334

Code Explanation

ctx.fillStyle = "blue";

Sets the color

builddeck(); Invokes the function to build the

deck of cards

back.src ="cardback.png"; Specifies the image for the back of

card (note that only one back
appears: the dealers hidden card)

canvas1 = document.getElementById('canvas'); Sets the variable for event handling

window.addEventListener('keydown',getkey,false); Sets up event handling for keydown .
presses

shuffle(); Invokes the function to shuffle

dealstart(); Invokes the function to deal out the

first four cards

} Closes the function

function getkey(event) {

Function to respond to keydown
events

var keyCode;

Holds the code designating the key

if(event == null)

Browser-specific code to determine
if the event is null

{ Open clause

keyCode = window.event.keyCode; Gets the key code from

window.event.keyCode

window.event.preventDefault(); Stops other key responses

}

Close clause

else { clause

keyCode = event.keyCode;

Picks up the key code from
even.keyCode