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console
<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>黑客帝国效果</title>
    <style type="text/css">
        body {
            margin: 0;
            padding: 0;
            overflow: hidden;
        }
    </style>
</head>

<body>
    <canvas id="canvas"></canvas>
    <script type="text/javascript">
    // 获取元素
    var canvas = document.getElementById('canvas');
    var ctx = canvas.getContext('2d');
    // 设值画布的宽度与高度
    canvas.height = window.innerHeight;
    canvas.width = window.innerWidth;
    // 创建需要绘画的字符数组
    var texts = '0101'.split('');
    // 设置绘画的字体大小
    var fontSize = 20;
    // 用于计算输出文字时坐标,所以长度即为列数
    var columns = canvas.width / fontSize;
    //初始值 
    var drops = [];
    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)'; // 设置背景颜色
        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>
</body>