以下是摘自文章8-Digit Hex Codes?的alpha值的十进制和十六进制对照表：
| Alpha % | Hex | Rgb 255 |
|---|---|---|
| 100% | FF | 255 |
| 95% | F2 | 242 |
| 90% | E6 | 230 |
| 85% | D9 | 217 |
| 80% | CC | 204 |
| 75% | BF | 191 |
| 70% | B3 | 179 |
| 65% | A6 | 166 |
| 60% | 99 | 153 |
| 55% | 8C | 140 |
| 50% | 80 | 128 |
| 45% | 73 | 115 |
| 40% | 66 | 102 |
| 35% | 59 | 89 |
| 30% | 4D | 77 |
| 25% | 40 | 64 |
| 20% | 33 | 51 |
| 15% | 26 | 38 |
| 10% | 1A | 26 |
| 5% | 0D | 13 |
| 0% | 00 | 0 |
根据以上表，我在6位HEX后面加上字符串D9就能轻松搞定背景颜色设置透明度85%的需求了～
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