如何为您的网站制作模糊的延迟图像加载？

Question

我有一个充满图片的网站，但网站性能很差。

我想让图像加载模糊，然后在滚动事件中图像将双加载。

我正在使用 PHP 和 Zend 框架

我正在寻找一个 java 脚本库或 php 函数来帮助我制作延迟加载图像，但我找不到一个易于使用的函数，因为我不想替换所有图片 manulay

我试过progressive-image.js性能提升了一点，我的主要目标是发出最少的请求数

是否有与google 图片

相同的脚本

我看过那个代码片段

 function imageLoaded(e) {
   updateImage(e.target, 'loaded');
 }

function imageError(e) {
  updateImage(e.target, 'error');
}

function updateImage(img, classname) {
  // Add the right class:
  img.classList.add(classname);

  // Remove the data-src attribute:
  img.removeAttribute('data-src');

  // Remove both listeners:
  img.removeEventListener('load', imageLoaded);
  img.removeEventListener('error', imageError);
}

window.addEventListener('load', () => {
  Array.from(document.getElementsByTagName('img')).forEach(img => {
    const src = img.getAttribute('data-src');

    if (src) {
      // Listen for both events:
      img.addEventListener('load', imageLoaded);
      img.addEventListener('error', imageError);

      // Just to simulate a slow network:
      setTimeout(() => {
        img.setAttribute('src', src);
      }, 2000 + Math.random() * 2000);
    }
  });
})

body {
  margin: 0;
  height: 100%;
}

.images {
  width: 100%;
  height: 100%;
  background: #000;
  display: flex;
  align-items: center;
  overflow-x: scroll;
}

.margin-fix {
    border-right: 1px solid transparent;
    height: 16px;
}

img {
  width: 16px;
  height: 16px;
  margin: 0 64px;
  background-image: url("data:image/gif;base64,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");
}

img.loaded {
  width: auto;
  height: 100%;
  margin: 0;
}

img.error {
  background: red;
  border-radius: 100%;

  /* You could add a custom "error" image here using background-image */
}

  <img
    src
    data-src="https://d39a3h63xew422.cloudfront.net/wp-content/uploads/2014/07/20145029/driven-by-design-the-incomparable-lancia-stratos-1476934711918-1000x573.jpg" />

  <img
    src
    data-src="https://car-images.bauersecure.com/pagefiles/76591/1752x1168/ford_racing_puma_01.jpg?mode=max&quality=90&scale=down" />

  <img
    src
    data-src="http://doesntexist.com/image.jpg" />

  <span class="margin-fix"></span>
</div>

Answer 1

现在更常见的是 javascript 是自重。花时间解压缩、解析和编译 - 图像越大有时速度越快。

https://developers.google.com/web/fundamentals/performance/optimizing-content-efficiency/javascript-startup-optimization/

还有其他方法，例如使用 loading="lazy" 仅加载视口中的内容。不需要 javascript！也对 SEO 更友好。

<img src="image.jpg" loading="lazy" alt="..." />
<iframe src="video-player.html" loading="lazy"></iframe>

也看一下请求 header 看看他们在请求什么。

浏览器正在发送 accept-type 多种格式。 WebP 可能会比 jpg 减少更多的大小，并且在有损压缩下看起来仍然不错。
他们也可能会发送 Save-Data 请求 header 更喜欢缩小尺寸而不是速度，也许为他们提供较小的图像，然后您再放大。
有些人甚至发送 client-hints 喜欢 Accept-CH: DPR, Width, Viewport-Width

坦率地说，我已经在我的移动浏览器中禁用了 javascript，因为总是会出现这么多垃圾。 cookie 通知、广告、订阅、权限请求，所以我更喜欢你刚刚使用 loading="lazy"

您还可以查看响应式图像的 srcset https://developer.mozilla.org/en-US/docs/Learn/HTML/Multimedia_and_embedding/Responsive_images

如何为您的网站制作模糊的延迟图像加载？

how to make a blurry lazy image loading for your website?

html

javascript

css

php

zend-framework