什么是CSS3 HSLA色彩模式？HSLA模拟渐变色条
HSLA色彩模式是HSL色彩模式的扩展，在色彩，饱和度，亮度三要素的基础上增加了不透明度参数。使用HSLA色彩模式，可以设计不同的透明效果。
语法：
hsla（<length>，<percentage>，<percentage>，<opacity>）
表示不透明度，取值在0和1之间。
实例：模拟渐变色条
XML/HTML Code复制内容到剪贴板 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>HSLA Color</title> <style type="text/css"> div {height:20px;} div:nth-child(1) { background:hsla(120,50%,50%,0.1); } div:nth-child(2) { background:hsla(120,50%,50%,0.2); } div:nth-child(3) { background:hsla(120,50%,50%,0.3); } div:nth-child(4) { background:hsla(120,50%,50%,0.4); } div:nth-child(5) { background:hsla(120,50%,50%,0.5); } div:nth-child(6) { background:hsla(120,50%,50%,0.6); } div:nth-child(7) { background:hsla(120,50%,50%,0.7); } div:nth-child(8) { background:hsla(120,50%,50%,0.8); } div:nth-child(9) { background:hsla(120,50%,50%,0.9); } div:nth-child(10) { background:hsla(120,50%,50%,1); } </style> </head> <body> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> </body> </html>演示效果：
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