HTML5+JS模仿骇客帝国文字矩阵效果

一款适合装X的HTML5+JS模仿骇客帝国文字矩阵效果，也是许多电影大片中常见的高大上电脑镜头。不过要注意了，这款特效是基于HTML5的，IE9以下的IE浏览器就不必尝试了，不支持HTML5的浏览器即使点击了运行代码也看不到什么。

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>HTML5模仿骇客帝国文字矩阵效果</title>
</head>
<body>

<canvas id="q"></canvas>
<script type="text/javascript" >
var s = window.screen;
var width = q.width = s.width;
var height = q.height = s.height;
var letters = Array(256).join(1).split('');
var draw = function () {
q.getContext('2d').fillStyle='rgba(0,0,0,.05)';
q.getContext('2d').fillRect(0,0,width,height);
q.getContext('2d').fillStyle='#0F0';
letters.map(function(y_pos, index){
text = String.fromCharCode(3e4+Math.random()*33);
x_pos = index * 10;
q.getContext('2d').fillText(text, x_pos, y_pos);
letters[index] = (y_pos > 758 + Math.random() * 1e4) ? 0 : y_pos + 10;
});
};
setInterval(draw, 33);
</script>

</body>
</html>