话不多说，直接上代码
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Code</title> <style> body{ margin: 0; overflow: hidden; } </style> </head> <body> <canvas id="myCanvas"></canvas> <script> const width = document.getElementById("myCanvas").width = screen.availWidth; const height = document.getElementById("myCanvas").height = screen.availHeight; const ctx = document.getElementById("myCanvas").getContext("2d"); const arr = Array(Math.ceil(width / 10)).fill(0); const str = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789".split(""); function rain() { ctx.fillStyle = "rgba(0,0,0,0.05)"; ctx.fillRect(0, 0, width, height); ctx.fillStyle = "#66ffff"; arr.forEach(function (value, index) { ctx.fillText(str[Math.floor(Math.random() * str.length)], index * 10, value + 10); arr[index] = value >= height || value > 9999 * Math.random() ? 0 : value + 10; }); } setInterval(rain, 30); </script> </body> </html>
