Web 浏览器中的开发人员菜单帮助
我主要使用 safari 进行网页浏览和网页开发测试，但我注意到在一些页面上，“Paint”在调试菜单下的时间线窗格中的渲染时间线下不断被触发。我想知道是否有人可以解释这可能是什么或意味着什么。我尝试在互联网上搜索，但找不到任何相关信息。它看起来像这样：
I mostly use safari for web browsing, and testing for web development, but I have noticed that on a few pages "Paint" is constantly being fired under the rendering timeline in the timeline pane under the debug menu. I was wondering if anyone could explain what that possibly could be or mean. I have tried searching the internet, but can not find any information on it. It looks like this:
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此行为可能表示 JavaScript 的基于时间的执行，如使用 setTimeout() 或 setInterval() 所做的那样。大多数浏览器都会进行重新绘制，即使对 dom 树进行微小的更改，也很难预测。如果您有相关页面的 URL，我们可以根据页面本身的问题来解决您的浏览器问题。
This behavior may be an indication of time-based execution of javascript, as done with setTimeout() or setInterval(). Most browsers will do repaint that's hard to predict even on small changes to the dom tree. If you have a URL for the page in question, we could sort out your browser issues from problems on the page itself.
这是由于我正在使用的一些插件。特别是 jScrollPane，由于其他插件的原因，可能会如此之高。
It is due, to some plugins I am using. specifically jScrollPane, could be so high, due to other plugins.
这可能是由于 HTML5 的画布元素不断被重新绘制。
It might be due to HTML5 with canvas elements constantly being repainted.
我认为加载的页面是否包含不同的元素（如图像、flash 等）；浏览器单独请求每个元素。一旦浏览器收到请求的元素，就会不断地触发“Paint”。
I think if the loaded page contains different elements (like images, flash,..); The browser requests each element separately. 'Paint' is constantly fired as soon as the requested element is received by the browser.