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Canvas - 如何讀取鍵代碼...

我們想知道如何讀取鍵代碼。... 




<!DOCTYPE html>
<html>
<head>
<script type='text/javascript' src='https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js'></script>
<script type='text/javascript'>//<![CDATA[ 
$(window).load(function(){
    canvas = $('canvas');
    context = canvas[0].getContext('2d');
    canvas.width(200);
    canvas.height(200);
    context.fillRect(50,50,50,50);
});//]]>  
</script>
</head>
<body>
  <canvas></canvas>
</body>
</html>