The ratio of the low frequency to high frequency components in HRV power spectrum(LF/HF) fluctuates with the change in the sleep stages.

HRV频谱中低频和高频成分的比值（LF/HF）随着睡眠深度的变化而波动。

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Obtained by testing the general components of the toolkit to meet the programmer's interface LF customization. And can customized in a short time needed to preview the UI appearance.

通过测试得出此工具可以满足程序员一般组件的界面外观的定制，并且可以在短时间内定制预览所需要的界面外观。

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