rgb格式转换成16进制格式

rgb2hex(rgb) {
    if (rgb.charAt(0) == '#') {
        return rgb
      } else {
        var ds = rgb.split(/\D+/)
        var decimal = Number(ds[1]) * 65536 + Number(ds[2]) * 256 + Number(ds[3])
        return this.zero_fill_hex(decimal, 6)
    }
}

zero_fill_hex(num, digits) {
    var s = num.toString(16)
    if (s.length < digits) {
        s = '0' + s
    }
    return s
},

this.colorin = this.rgb2hex(obj.color)

参考链接：https://www.jb51.net/article/69303.htm