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黑客帝国代码雨

作者：互联网

<!DOCTYPE html><html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <title>Hack Coding Raining</title>
    <style>
      * {
        margin: 0;
        padding: 0;
      }
      body {
        background: black;
      }
      canvas {
        display: block;
      }
    </style>
  </head>
  <body>
    <canvas id="waterfall"></canvas>
    <script>
      var waterfall = document.getElementById("waterfall");
      var ctx = waterfall.getContext("2d");
      waterfall.height = window.innerHeight;
      waterfall.width = window.innerWidth;
      var chinese = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ~!@#$%^&*()_+";
      chinese = chinese.split("");
      var font_size = 10;
      var columns = waterfall.width / font_size;
      var drops = [];
      for (var x = 0; x < columns; x++) drops[x] = 1;
      function draw() {
        ctx.fillStyle = "rgba(0, 0, 0, 0.05)";
        ctx.fillRect(0, 0, waterfall.width, waterfall.height);
        ctx.fillStyle = "#0F0";
        ctx.font = font_size + "px arial";
        for (var i = 0; i < drops.length; i++) {
          var text = chinese[Math.floor(Math.random() * chinese.length)];
          ctx.fillText(text, i * font_size, drops[i] * font_size);
          if (drops[i] * font_size > waterfall.height && Math.random() > 0.975)
            drops[i] = 0;
          drops[i]++;
        }
      }
      setInterval(draw, 50);
    </script>
  </body>
</html>

标签：font,代码,ctx,waterfall,黑客帝国,var,drops,size
来源： https://www.cnblogs.com/aboa/p/15704825.html