如何延迟加载内嵌在iframe上的youtube视频? [英] How to lazy load a youtube video embedded on an iframe?

问题描述

如何将延迟加载应用于嵌入视频的 iframe ?

How do I apply lazy loading to an iframe embedding a video?

<iframe src="https://www.youtube.com/embed/teL-R6yimDY"
    allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture"
    allowfullscreen=""
    width="560"
    height="315"
    frameborder="0"></iframe>

我尝试添加 loading ="eager" ， loading ="auto" 和 loading ="lazyload"

推荐答案

您可以在 iframe 标记内使用 srcdoc 属性来加载图像.请参阅以下示例作为参考:

You can use srcdoc attribute inside your iframe tag to load an image. Please see the following example as reference:

<iframe
  width="560"
  height="315"
  src="https://www.youtube.com/embed/Y8Wp3dafaMQ"
  srcdoc="<style>*{padding:0;margin:0;overflow:hidden}html,body{height:100%}img,span{position:absolute;width:100%;top:0;bottom:0;margin:auto}span{height:1.5em;text-align:center;font:48px/1.5 sans-serif;color:white;text-shadow:0 0 0.5em black}</style><a href=https://www.youtube.com/embed/Y8Wp3dafaMQ?autoplay=1><img src=https://img.youtube.com/vi/Y8Wp3dafaMQ/hqdefault.jpg alt='Video The Dark Knight Rises: What Went Wrong? – Wisecrack Edition'><span>▶</span></a>"
  frameborder="0"
  allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture"
  allowfullscreen
  title="The Dark Knight Rises: What Went Wrong? – Wisecrack Edition"
></iframe>

来源:

https://codepen.io/chriscoyier/pen/GRKZryx

https://css-tricks.com/lazy-load-嵌入式YouTube视频/

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