TS实现代码雨

效果

 

 

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>rain</title>
</head>
<body>
    <canvas id="rain"></canvas>
    <script src="rain.js"></script>
</body>
</html>

 

TS实现

// 代码雨
let canvas = document.querySelector('#rain') as HTMLCanvasElement
let ctx = canvas.getContext('2d') as CanvasRenderingContext2D
canvas.height = screen.availHeight; //可视区域的高度
canvas.width = screen.availWidth; //可视区域的宽度
let str: string[] = 'HarryAlanYYDS'.split('')
let Arr = Array(Math.ceil(canvas.width / 10)).fill(0) //获取宽度例如1920 / 10 192
console.log(Arr);
 
const rain = () => {
    ctx.fillStyle = 'rgba(0,0,0,0.05)'//填充背景颜色
    ctx.fillRect(0, 0, canvas.width, canvas.height)//背景
    ctx.fillStyle = "#0f0"; //文字颜色
    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; //添加随机数让字符随机出现不至于那么平整
    })
    // console.log(Arr);
    
}
setInterval(rain, 40)

 

编译的JS

// 代码雨
var canvas = document.querySelector('#rain');
var ctx = canvas.getContext('2d');
canvas.height = screen.availHeight; //可视区域的高度
canvas.width = screen.availWidth; //可视区域的宽度
var str = 'HarryAlanYYDS'.split('');
var Arr = Array(Math.ceil(canvas.width / 10)).fill(0); //获取宽度例如1920 / 10 192
console.log(Arr);
var rain = function () {
    ctx.fillStyle = 'rgba(0,0,0,0.05)'; //填充背景颜色
    ctx.fillRect(0, 0, canvas.width, canvas.height); //背景
    ctx.fillStyle = "#0f0"; //文字颜色
    Arr.forEach(function (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; //添加随机数让字符随机出现不至于那么平整
    });
    // console.log(Arr);
};
setInterval(rain, 40);

 

posted @ 2023-03-17 02:20  泠风lj  阅读(94)  评论(0)    收藏  举报