【每日一题】- 2020-04-20 - 浏览器tab转圈圈是怎么做到的？

[azl397985856]

如上，浏览器会在页面加载的过程中转圈，加载完成之后就停止了。 那么具体什么时候开始转，什么时候停止呢？这个功能是怎么实现的（内部原理是怎么样的）？

扩展：

• 实现progress-bar,开始和结束时机和上面一样。
• 实现progress-bar，带有确切进度条的功能

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[azl397985856]

监听资源加载的事件，当首屏资源全部加载完成就将loading去掉即可。

如果你是做内核开发，可以直接监听静态资源的声明周期，如果你是web 前端，可以监听 onload 事件。

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.