黑客帝国文字雨

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
</head>
<body>
<canvas id="viewStyle"></canvas>
<script>
var winObject = window.screen;
var width = viewStyle.width = winObject .width;
var height = viewStyle.height = winObject .height;
var letters = Array(256).join(1).split('');
var draw = function () {
viewStyle.getContext('2d').fillStyle = 'rgba(0,0,0,.05)';
viewStyle.getContext('2d').fillRect(0, 0, width, height);
viewStyle.getContext('2d').fillStyle = '#0F0';
letters.map(function (y_pos, index) {
text = String.fromCharCode(/*3e4*/ 65 + Math.random() * 33);
x_pos = index * 10;
viewStyle.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>