The default draw rate is 60 frames per second, although you can alter this rate by calling the frameRate function.
默认的绘制速度是每秒60个画面,但是您也可以通过调用frameRate函数来更改这个速度。
A video camera takes a picture of a scene. It does this at a frame rate of 30 frames per second.
摄像机每秒钟拍摄30张(帧)图片。
It can be called multiple times per frame, if the frame rate is low and it may not be called between frames at all if the frame rate is high.
当帧率比较低时,它每帧被调用多次,如果帧率比较高,它有可能就不会被调用。
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