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htnl根据轮播图图片切换背景色

news 2025/8/8 7:09:11

htnl根据轮播图图片切换背景色

<!DOCTYPE html>
<html><head><meta charset="UTF-8"><title>轮播图示例</title><link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/swiper@10/swiper-bundle.min.css" /><script src="https://cdn.jsdelivr.net/npm/swiper@10/swiper-bundle.min.js"></script><style>.swiper-container {width: 80%;height: 300px;overflow: hidden;}.swiper-slide {width: 100%;height: 100%;background-size: cover;background-position: center;}</style>
</head><body><div class="swiper-container"><div class="swiper-wrapper"><div class="swiper-slide" style="background-image: url(./img/1.png);"></div><div class="swiper-slide" style="background-image: url(./img/2.png);"></div><div class="swiper-slide" style="background-image: url(./img/3.png);"></div></div></div><script>// 获取轮播图容器const swiperContainer = document.querySelector('.swiper-container');// 初始化 Swiper 实例const swiper = new Swiper(swiperContainer, {autoplay: true,loop: true,on: {slideChangeTransitionEnd: function () {// 获取当前轮播图的背景图片 URLconst currentSlide = this.slides[this.activeIndex];const backgroundImage = currentSlide.style.backgroundImage;// 创建一个 Image 对象const img = new Image();img.src = backgroundImage.slice(5, -2);// 等待图片加载完成img.onload = function () {// 创建一个 Canvas 元素const canvas = document.createElement('canvas');canvas.width = img.width;canvas.height = img.height;// 在 Canvas 上绘制图片const ctx = canvas.getContext('2d');ctx.drawImage(img, 0, 0);// 获取图片的像素数据const imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);const colors = {};for (let i = 0; i < imageData.data.length; i += 4) {const r = imageData.data[i];const g = imageData.data[i + 1];const b = imageData.data[i + 2];const color = `${r},${g},${b}`;if (colors[color]) {colors[color]++;} else {colors[color] = 1;}}const dominantColor = Object.keys(colors).reduce((a, b) => colors[a] > colors[b] ? a : b);// 设置页面背景色document.body.style.backgroundColor = `rgb(${dominantColor})`;};}}});</script>
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