今天学了一个新玩意，看起来很有科技感，代码雨，像下雨一样
- HTML
<!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>Document</title>
<style>
* {
padding: 0;
margin: 0;
overflow: hidden;
}
</style>
</head>
<body>
<canvas id="canvas"></canvas>
<script src="./index.js"></script>
</body>
</html>
-ts
let canvas:HTMLCanvasElement | null = document.querySelector('canvas') as HTMLCanvasElement
let ctx = canvas.getContext('2d') as any
canvas.width = screen.availWidth
canvas.height = screen.availHeight
let str: string = 'lxmheiheihei'
let Arr = Array(Math.ceil(canvas.width / 10)).fill(0)
const rain = () => {
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
})
}
setInterval(rain, 50)
