CSS学习（十五）-CSS颜色模式CSS颜色透明度

Posted 2020-06-23 bwshqh

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一、理论：
1.CSS3颜色模式
a.RGBA颜色模式，在RGB基础上加了控制alpha透明度的参数
b.HSL颜色模式：色调饱和度亮度
c.HSLA颜色模式：A值取于0-1之间，值越大，透明度越低
2.RGBA/HSLA滤镜格式
a.需要用转换工具才能在ie8及以下版本中使用RGBA/HSLA颜色模式相同的透明度，需要将RGBA/HSLA中的透明值乘以255，然后将其转换成十六进制值

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{
            width: 80px;
            height: 80px;
            line-height: 80px;
            text-align: center;
            float:left;
        }
        .row:nth-of-type(1) div {
            background: rgba(135,162,31,0.8);
        }
        .row:nth-of-type(2) div {
            background: rgba(135,162,31,0.6);
        }
        .row:nth-of-type(3) div {
            background: rgba(135,162,31,0.4);
        }
        .row:nth-of-type(4) div{
            background: rgba(135,162,31,0.2);
        }
        .row div:nth-child(1){
            background: rgba(135,162,31,0.8);
        }
        .row div:nth-child(2){
            background: rgba(135,162,31,0.7);
        }
        .row div:nth-child(3){
            background: rgba(135,162,31,0.6);
        }
        .row div:nth-child(4){
            background: rgba(135,162,31,0.5);
        }
        .row div:nth-child(5){
            background: rgba(135,162,31,0.4);
        }
        .row div:nth-child(6){
            background: rgba(135,162,31,0.3);
        }
        .row div:nth-of-type(1) div {
            background: rgba(135,162,31,0.2);
        }
    </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>

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style type="text/css">
        .row{
            overflow: hidden;
        }
        .row div{
            width: 80px;
            height: 80px;
            line-height: 80px;
            text-align: center;
            float:left;
        }
        .row:nth-of-type(1) div {
            background: hsl(133,100%,80%);
        }
        .row:nth-of-type(2) div {
            background: hsl(133,80%,80%);
        }
        .row:nth-of-type(3) div {
            background:  hsl(133,60%,80%);
        }
        .row:nth-of-type(4) div{
            background: hsl(133,50%,80%);
        }
        .row div:nth-child(1){
            background: hsl(33,100%,70%);
        }
        .row div:nth-child(2){
            background: hsl(33,90%,70%);
        }
        .row div:nth-child(3){
            background: hsl(33,80%,70%);
        }
        .row div:nth-child(4){
            background: hsl(33,70%,70%);
        }
        .row div:nth-child(5){
            background: hsl(33,60%,70%);
        }
        .row div:nth-child(6){
            background: hsl(33,50%,70%);
        }
        .row div:nth-of-type(1) div {
            background: hsl(33,100%,70%);
        }
    </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>

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