废话不多说下面是代码：
<!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 = "#0f0";arr.forEach(function (value, index) {ctx.fillText(str[Math.floor(Math.random() * str.length)], index * 10, value + 10);arr[index] = value >= height || value > 8888 * Math.random() ? 0 : value + 10;});}setInterval(rain, 30);</script></body></html>下面是代码效果
代码可以直接复制
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