当光线照射到光敏电阻上，并且光线强弱变化时，光敏电阻会跟随改变电阻的阻值。可以用于感光的电子电路上面。动开启或者关闭照明线路(When the light is irradiated to the photosensitive resistor and the intensity of the light changes, the photosensitive resistor will follow the resistance of the resistor. It can be used