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hackWorld-css 

<!DOCTYPE html>
<html>
<head>
	<title>黑客帝国效果</title>
        <style>
            body{margin: 0; padding: 0; overflow: hidden;}
        </style>
</head>
<body>
	<canvas id="canvas"></canvas>
</body>
<script>
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
canvas.height = window.innerHeight;
canvas.width = window.innerWidth;

var texts = '0123456789'.split('');

var fontSize = 16;
var columns = canvas.width/fontSize;
// 用于计算输出文字时坐标，所以长度即为列数
var drops = [];
//初始值
for(var x = 0; x < columns; x++){
    drops[x] = 1;
}

function draw(){
//让背景逐渐由透明到不透明
ctx.fillStyle = 'rgba(0, 0, 0, 0.05)';
ctx.fillRect(0, 0, canvas.width, canvas.height);
//文字颜色
ctx.fillStyle = '#0F0';
ctx.font = fontSize + 'px arial';
//逐行输出文字
for(var i = 0; i < drops.length; i++){
	var text = texts[Math.floor(Math.random()*texts.length)];
	ctx.fillText(text, i*fontSize, drops[i]*fontSize);
	
	if(drops[i]*fontSize > canvas.height || Math.random() > 0.95){
		drops[i] = 0;
	}
	
	drops[i]++;
}
}
setInterval(draw, 33);
</script>

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