代码雨 

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            padding: 0;
            margin: 0;
            overflow: hidden;
        }
    </style>
</head>
<body>
    <canvas id="canvas"></canvas>
    <script src="./code_rain.js"></script>
</body>
</html>
var canvas = document.querySelector('canvas');
console.log(canvas);
var ctx = canvas.getContext('2d');
canvas.width = screen.availWidth;
canvas.height = screen.availHeight;
var str = 'QWERTYUIOPASDFGHJKLZXCVBNM1234567890'.split('');
var arr = Array(Math.ceil(canvas.width / 10)).fill(0);
console.log(arr);
var rain = function () {
    ctx.fillStyle = 'rgba(0,0,0,0.05)';
    ctx.fillRect(0, 0, canvas.width, canvas.height);
    ctx.fillStyle = '#0f0';
    arr.forEach(function (item, index) {
        console.log(item, index);
        ctx.fillText(str[Math.floor(Math.random() * str.length)], index * 10, item + 10); //填充文字，x轴位置，y轴位置
        arr[index] = item > canvas.height || item > 10000 * Math.random() ? 0 : item + 10;
    });
};
setInterval(rain, 60);

效果（真实效果为动态）：

 

posted @ 2023-11-01 11:12  芬-mi  阅读(17)  评论(0)  编辑  收藏  举报