CSS学习（十六）-HSLA颜色模式

一、理论：
1.HSLA颜色模式
a.HSLA在HSL基础上添加了不透明度，值越大透明度越低
b.HSLA颜色模式的浏览器兼容性和HSL一样，仅仅有较新版本号的主流浏览器才支持
2.RGBA和HSLA颜色模式二者能够全然相互替换
3.RGBA/HSLA的IE兼容方案
a.在IE8下面版本号。一般在前面设置一个非透明色，在其后紧跟一个RGBA/HSLA颜色模式
b.将透明的PNG图片平铺做为背景图片，适用于ie7-8
c.使用Gradient滤镜能够指定半透明颜色。将起止色设置为同一种颜色就可以避免产生渐变

二、实践：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style type="text/css">
        .row{
            overflow: hidden;
        }
        .row div{
             80px;
            height: 80px;
            line-height: 80px;
            text-align: center;
            float:left;
        }
        .row:nth-of-type(1) div {
            background: hsla(183,50%,50%,1);
        }
        .row:nth-of-type(2) div {
            background: hsla(133,50%,50%,.8);
        }
        .row:nth-of-type(3) div {
            background:  hsla(133,50%,50%,.6);
        }
        .row:nth-of-type(4) div{
            background: hsla(133,50%,50%,.4);
        }
        .row div:nth-child(1){
            background: hsla(133,50%,50%,.2);
        }
        .row div:nth-child(2){
            background: hsla(133,50%,50%,.1);
        }
        .row div:nth-child(3){
            background: hsla(133,50%,50%,.2);
        }
        .row div:nth-child(4){
            background: hsla(133,50%,50%,.3);
        }
        .row div:nth-child(5){
            background: hsla(133,50%,50%,.4);
        }
        .row div:nth-child(6){
            background: hsla(133,50%,50%,.5);
        }
        .row div:nth-of-type(1) div {
            background: hsla(133,50%,50%,.6);
        }
    </style>
</head>
<body>
<div class="demo">
    <div class="row">
        <div>
            1
        </div>
        <div>
            0.8
        </div>
        <div>
            0.6
        </div>
        <div>
            0.4
        </div>
        <div>
            0.2
        </div>
    </div>
    <div class="row">
        <div>
            1
        </div>
        <div>
            0.8
        </div>
        <div>
            0.6
        </div>
        <div>
            0.4
        </div>
        <div>
            0.2
        </div>
    </div>
    <div class="row">
        <div>
            1
        </div>
        <div>
            0.8
        </div>
        <div>
            0.6
        </div>
        <div>
            0.4
        </div>
        <div>
            0.2
        </div>
    </div>
    <div class="row">
        <div>
            1
        </div>
        <div>
            0.8
        </div>
        <div>
            0.6
        </div>
        <div>
            0.4
        </div>
        <div>
            0.2
        </div>
    </div>
    <div class="row">
        <div>
            1
        </div>
        <div>
            0.8
        </div>
        <div>
            0.6
        </div>
        <div>
            0.4
        </div>
        <div>
            0.2
        </div>
    </div>
</div>

</body>
</html>