js计算公式：luma = ( r * 0.2126 + g * 0.7152 + b * 0.0722 ) / 255
css属性filter：grayscale + contrast + invert
利用css属性计算
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js给css传入变量值 style="--num: 1" css中：var(--num)
通过clamp(Min,Val,Max)来实现范围控制
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