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TODO
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浏览器组成中有两大引擎,JS引擎和渲染引擎。
Frame(帧)是渲染引擎每隔16ms(默认60fps)将渲染树渲染、合成成位图的结果
每次Event Loop是JS引擎执行的一个周期,执行过程中可能依赖渲染引擎的执行结果,比如访问DOM和CSSOM,也可能影响渲染引擎绘制帧,比如调用 requestAnimationFrame,在每个帧开始绘制时执行一段回调函数(通常包含影响渲染结果的代码)
因此 Frame 和 Event Loop 是相对独立运行的,但是 Event Loop 中执行的代码可能依赖或影响 Frame
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