• 使用：6位颜色值+2位透明度值

color: #000000D4;
/* 等价于 */
color: #000000;
opacity : 0.83; 
/* 等价于 */
color: #000000;
opacity : 83%; 

• 对照表（0：完全透明，1：不透明）

透明度值百分百值十六进制值00%000.011%030.022%050.033%080.044%0A0.055%0D0.066%0F0.077%120.088%140.099%170.1010%1A0.1111%1C0.1212%1F0.1313%210.1414%240.1515%260.1616%290.1717%2B0.1818%2E0.1919%300.2020%330.2121%360.2222%380.2323%3B0.2424%3D0.2525%400.2626%420.2727%450.2828%470.2929%4A0.3030%4D0.3131%4F0.3232%520.3333%540.3434%570.3535%590.3636%5C0.3737%5E0.3838%610.3939%630.4040%660.4141%690.4242%6B0.4343%6E0.4444%700.4545%730.4646%750.4747%780.4848%7A0.4949%7D0.5050%800.5151%820.5252%850.5353%870.5454%8A0.5555%8C0.5656%8F0.5757%910.5858%940.5959%960.6060%990.6161%9C0.6262%9E0.6363%A10.6464%A30.6565%A60.6666%A80.6767%AB0.6868%AD0.6969%B00.7070%B30.7171%B50.7272%B80.7373%BA0.7474%BD0.7575%BF0.7676%C20.7777%C40.7878%C70.7979%C90.8080%CC0.8181%CF0.8282%D10.8383%D40.8484%D60.8585%D90.8686%DB0.8787%DE0.8888%E00.8989%E30.9090%E60.9191%E80.9292%EB0.9393%ED0.9494%F00.9595%F20.9696%F50.9797%F70.9898%FA0.9999%FC1100%FF