js hex颜色转rgba

const hexToRgba = (hex, opacity) => {
        let rgbaColor = ''
        const reg = /^#[\da-f]{6}$/i
        if (reg.test(hex)) {
          rgbaColor = `rgba(${parseInt('0x' + hex.slice(1, 3))},${parseInt('0x' + hex.slice(3, 5))},${parseInt('0x' + hex.slice(5, 7))},${opacity})`
        }
        return rgbaColor
      }