使用html5写一个背景粒子特效

创建一个背景粒子特效需要综合运用HTML5、CSS3和JavaScript。以下是一个简单的示例，演示如何使用HTML5的<canvas>元素和JavaScript来创建一个粒子动画背景。

HTML

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>粒子特效背景</title>
    <link rel="stylesheet" href="styles.css">
</head>
<body>
    <canvas id="particleCanvas"></canvas>
    <script src="script.js"></script>
</body>
</html>

CSS (styles.css)

body, html {
    margin: 0;
    padding: 0;
    overflow: hidden;
    width: 100%;
    height: 100%;
}

canvas {
    position: absolute;
    top: 0;
    left: 0;
}

JavaScript (script.js)

const canvas = document.getElementById('particleCanvas');
const ctx = canvas.getContext('2d');

canvas.width = window.innerWidth;
canvas.height = window.innerHeight;

class Particle {
    constructor() {
        this.x = Math.random() * canvas.width;
        this.y = Math.random() * canvas.height;
        this.size = Math.random() * 5 + 1;
        this.speedX = (Math.random() - 0.5) * 4;
        this.speedY = (Math.random() - 0.5) * 4;
    }

    draw() {
        ctx.fillStyle = 'rgba(173,216,230, 0.8)';
        ctx.strokeStyle = 'rgba(173,216,230, 0.8)';
        ctx.lineWidth = 2;
        ctx.beginPath();
        ctx.arc(this.x, this.y, this.size, 0, Math.PI * 2);
        ctx.closePath();
        ctx.fill();
    }

    update() {
        this.x += this.speedX;
        this.y += this.speedY;

        if (this.x < 0 || this.x > canvas.width || this.y < 0 || this.y > canvas.height) {
            this.x = Math.random() * canvas.width;
            this.y = Math.random() * canvas.height;
        }
    }
}

const particles = [];

for (let i = 0; i < 100; i++) {
    particles.push(new Particle());
}

function animate() {
    ctx.clearRect(0, 0, canvas.width, canvas.height);

    for (let i = 0; i < particles.length; i++) {
        particles[i].draw();
        particles[i].update();
    }

    requestAnimationFrame(animate);
}

animate();

window.addEventListener('resize', () => {
    canvas.width = window.innerWidth;
    canvas.height = window.innerHeight;
});

这段代码创建了一个包含100个粒子的系统，每个粒子都有自己的位置、大小和速度。粒子在画布上移动，并在碰到画布边缘时重新定位到随机位置。通过调整粒子的属性（如颜色、大小和速度），你可以自定义动画的外观和行为。

posted @ 2024-12-25 09:49  王铁柱6  阅读(288)  评论(0)    收藏  举报