求助怎么实现 rpx转px

// px转rpx  
export const pxTorpx = (value: number) => {  
    const systemInfo: any = uni.getSystemInfoSync()  
    if(!value || typeof(value) !== 'number') {  
        return value  
    }  
    // 1rpx 对应的px值  
    const scale = systemInfo.screenWidth / 750  
    return Math.floor(value / scale)  
}  

// rpx转px  
export const rpxTopx = (value: number) => {  
    const systemInfo: any = uni.getSystemInfoSync()  
    if(!value || typeof(value) !== 'number') {  
        return value  
    }  
    // 1rpx 对应的px值  
    const scale = systemInfo.screenWidth / 750  
    return Math.floor(scale * value)  
}