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js实现图片变换

2026-02-03 05:01:08JavaScript

使用JavaScript实现图片变换

方法一：通过修改src属性切换图片

const image = document.getElementById('myImage');
const imageSources = ['image1.jpg', 'image2.jpg', 'image3.jpg'];
let currentIndex = 0;

function changeImage() {
  currentIndex = (currentIndex + 1) % imageSources.length;
  image.src = imageSources[currentIndex];
}

// 定时切换
setInterval(changeImage, 2000);

方法二：使用CSS类切换实现淡入淡出效果

const image = document.getElementById('myImage');
const imageSources = ['image1.jpg', 'image2.jpg', 'image3.jpg'];
let currentIndex = 0;

function fadeImage() {
  image.classList.add('fade-out');

  setTimeout(() => {
    currentIndex = (currentIndex + 1) % imageSources.length;
    image.src = imageSources[currentIndex];
    image.classList.remove('fade-out');
  }, 500);
}

// 添加CSS样式
const style = document.createElement('style');
style.textContent = `
  .fade-out {
    opacity: 0;
    transition: opacity 0.5s ease;
  }
`;
document.head.appendChild(style);

setInterval(fadeImage, 3000);

方法三：使用Canvas实现高级图像变换

const canvas = document.getElementById('myCanvas');
const ctx = canvas.getContext('2d');
const images = [
  new Image(), new Image(), new Image()
];
images.forEach((img, i) => img.src = `image${i+1}.jpg`);

let currentImg = 0;
let alpha = 0;

function draw() {
  ctx.globalAlpha = 1;
  ctx.drawImage(images[currentImg], 0, 0, canvas.width, canvas.height);

  if(alpha < 1) {
    ctx.globalAlpha = alpha;
    ctx.drawImage(images[(currentImg + 1) % images.length], 0, 0, canvas.width, canvas.height);
    alpha += 0.01;
  } else {
    alpha = 0;
    currentImg = (currentImg + 1) % images.length;
  }

  requestAnimationFrame(draw);
}

images[0].onload = function() {
  canvas.width = images[0].width;
  canvas.height = images[0].height;
  draw();
};

方法四：使用WebGL实现3D图片变换

const canvas = document.getElementById('glCanvas');
const gl = canvas.getContext('webgl');

// 初始化WebGL程序、着色器等
// 加载纹理
const textures = [];
const imageUrls = ['image1.jpg', 'image2.jpg', 'image3.jpg'];

imageUrls.forEach((url, i) => {
  textures[i] = gl.createTexture();
  const image = new Image();
  image.onload = function() {
    gl.bindTexture(gl.TEXTURE_2D, textures[i]);
    gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, image);
    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
  };
  image.src = url;
});

let currentTexture = 0;
let mixFactor = 0;

function render() {
  // 设置混合因子uniform
  // 绑定两个纹理
  // 绘制场景

  mixFactor += 0.01;
  if(mixFactor >= 1) {
    mixFactor = 0;
    currentTexture = (currentTexture + 1) % textures.length;
  }

  requestAnimationFrame(render);
}

render();

注意事项

js实现图片变换