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html 代码
<!DOCTYPE html>
<html>
<head>
<meta charset=”utf-8″>
<meta name=”Author” content=”aoliann”>
<title>un</title>
<style type=”text/css”>
* {
margin: 0;
padding: 0;
}
html,
body {
height: 100%;
overflow: hidden;
}
canvas {
display: block;
background: #000;
}
</style>
</head>
<body>
<canvas id=’canvas’>
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</canvas>
<script type=”text/javascript”>
var can = document.getElementById(“canvas”);
var cxt = can.getContext(‘2d’); //设置绘图环境
var w = canvas.width = window.screen.width;
var h = canvas.height = window.screen.height;
var words = Array(256).join(‘1’).split(”);
var text = ”;
var x = 0;
function draw() {
cxt.fillStyle = ‘rgba(0,0,0,0.05)’;
cxt.fillRect(0, 0, w, h);
cxt.fillStyle = color();
words.map(function (y, n) {
text = String.fromCharCode(65 + Math.ceil(Math.random() * 57));
x = n * 10;
cxt.fillText(text, x, y);
words[n] = y > (768 + Math.random() * 484) ? 0 : y + 10;
});
}
setInterval(draw, 30);
function color() {
var r = Math.floor(Math.random() * 256);
var g = Math.floor(Math.random() * 256);
var b = Math.floor(Math.random() * 256);
return “rgb(” + r + “,” + g + “,” + b + “)”
}
</script>
</body>
</html>
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