不是 lazyload；点击按钮而不是点击 <iframe> 元素，以免误触；会忽略大小较小的 <iframe> 元素。
当前为
Just modify the code to change the behavior. If you need a lazyload version, but can't code it yourself, I'm glad to say now you can do this by just set loading=lazy attribute to the <iframe> (and <img>) elements, for newest modern browsers:
And there are some lazyload libs for reference, for older browsers. Here is one of them: