1、HTML代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>js实现代码雨</title>
<style>
*,body{
margin: 0;
padding: 0;
}
canvas{
display: block;
}
</style>
</head>
<body>
<canvas></canvas>
<script src="./js/index.js"></script>
</body>
</html>
2、js代码，将如下代码保存为 index.js
let canvas = document.querySelector('canvas');
let ctx = canvas.getContext('2d');
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
let str = "jiaowohaizi".split('');
let arr = Array(Math.ceil(canvas.width / 10)).fill(0);
let run = () => {
ctx.fillStyle = 'rgba(0,0,0,0.05)';
ctx.fillRect(0, 0, canvas.width, canvas.height);
ctx.fillStyle = '#0f0';
arr.forEach((item, index) => {
ctx.fillText(str[Math.floor(Math.random() * str.length)], index * 10, item + 10);
arr[index] = item > canvas.height || item > 10000 * Math.random() ? 0 : item + 10;
});
};
// run()
setInterval(run, 40);
3、运行效果
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