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前言
最近接到需求，是 rgba 转换为 16 进制，一开始我还和产品争论，16 进制不都是不透明颜色吗？透明的怎么转换为 16 进制呢？没错，原来真的可以转换，看来我落伍了。我很久之前就写过一篇文章 JS 十六进制颜色（#fff）与 RGB, HSL 颜色的相互转换 ，感兴趣点击查看，我之前的 rgba 都是转换为 2 个颜色，一个是 rgb，一个是 opacity 透明度，没有想到，rgba 竟然可以转换为一个 16 进制的颜色，只不过由原来 6 位变为 8 位。
颜色透明度对照表
100% — FF
99% — FC
98% — FA
97% — F7
96% — F5
95% — F2
94% — F0
93% — ED
92% — EB
91% — E8
90% — E6
89% — E3
88% — E0
87% — DE
86% — DB
85% — D9
84% — D6
83% — D4
82% — D1
81% — CF
80% — CC
79% — C9
78% — C7
77% — C4
76% — C2
75% — BF
74% — BD
73% — BA
72% — B8
71% — B5
70% — B3
69% — B0
68% — AD
67% — AB
66% — A8
65% — A6
64% — A3
63% — A1
62% — 9E
61% — 9C
60% — 99
59% — 96
58% — 94
57% — 91
56% — 8F
55% — 8C
54% — 8A
53% — 87
52% — 85
51% — 82
50% — 80
49% — 7D
48% — 7A
47% — 78
46% — 75
45% — 73
44% — 70
43% — 6E
42% — 6B
41% — 69
40% — 66
39% — 63
38% — 61
37% — 5E
36% — 5C
35% — 59
34% — 57
33% — 54
32% — 52
31% — 4F
30% — 4D
29% — 4A
28% — 47
27% — 45
26% — 42
25% — 40
24% — 3D
23% — 3B
22% — 38
21% — 36
20% — 33
19% — 30
18% — 2E
17% — 2B
16% — 29
15% — 26
14% — 24
13% — 21
12% — 1F
11% — 1C
10% — 1A
9% — 17
8% — 14
7% — 12
6% — 0F
5% — 0D
4% — 0A
3% — 08
2% — 05
1% — 03
0% — 00改造 RGB 转为十六进制代码
改造代码如下，这样就可以通过一个函数，将 RGBA 直接转换为十六进制了。
let colorOpacity={
100:'ff',
99: 'fc',
98: 'fa',
97: 'f7',
96: 'f5',
95: 'f2',
94: 'f0',
93: 'ed',
92: 'eb',
91: 'e8',
90: 'e6',
89: 'e3',
88: 'e0',
87: 'de',
86: 'db',
85: 'd9',
84: 'd6',
83: 'd4',
82: 'd1',
81: 'cf',
80: 'cc',
79: 'c9',
78: 'c7',
77: 'c4',
76: 'c2',
75: 'bf',
74: 'bd',
73: 'ba',
72: 'b8',
71: 'b5',
70: 'b3',
69: 'b0',
68: 'ad',
67: 'ab',
66: 'a8',
65: 'a6',
64: 'a3',
63: 'a1',
62: '9e',
61: '9c',
60: '99',
59: '96',
58: '94',
57: '91',
56: '8f',
55: '8c',
54: '8a',
53: '87',
52: '85',
51: '82',
50: '80',
49: '7d',
48: '7a',
47: '78',
46: '75',
45: '73',
44: '70',
43: '6e',
42: '6b',
41: '69',
40: '66',
39: '63',
38: '61',
37: '5e',
36: '5c',
35: '59',
34: '57',
33: '54',
32: '52',
31: '4f',
30: '4d',
29: '4a',
28: '47',
27: '45',
26: '42',
25: '40',
24: '3d',
23: '3b',
22: '38',
21: '36',
20: '33',
19: '30',
18: '2e',
17: '2b',
16: '29',
15: '26',
14: '24',
13: '21',
12: '1f',
11: '1c',
10: '1a',
9: '17',
8: '14',
7: '12',
6: '0f',
5: '0d',
4: '0a',
3: '08',
2: '05',
1: '03',
0: '00',
}
let colorRgbaToHex = function(color){
let that = color;
// 如果是 rgba 颜色表示
if (/^(rgba|RGBA)/.test(that)) {let aColor = that.replace(/(?:(|)|rgba|RGBA)*/g, "").split(",");
let opacity = aColor.pop()
let opacityHax = !isNaN(opacity)?colorOpacity[Number(opacity) *100]:''let strHex ="#";
for (let i=0; i小结
本文是 haorooms 博客整理，欢迎访问 haorooms 前端博客 。RGBA 透明色转换为 16 进制颜色，就到这里。
正文完
