时间:2021-07-01 10:21:17 帮助过:20人阅读
1、背景属性复习:
background-image
background-color
background-repeat
background-position
background-attachment
2、新增属性:
background-size:
background-size:x y; // 水平 垂直方向的尺寸,像素/百分比/auto/⋯
background-size:cover; //保持宽高比不变,保证占满盒子,但不保证能看到全部
background-size:contain; //保持宽高比不变,保证看清全图,但可能占不满盒子
多背景:
background-image:url(1.jpg),url(2.jpg);
background-origin 背景区域定位
border-box: 从border区域开始显示背景
padding-box: 从padding区域开始显示背景
content-box: 从content内容区域开始显示背景
background-clip 背景绘制区域
border-box: 从border区域开始绘制背景
padding-box: 从padding区域开始绘制背景
content-box: 从content内容区域开始显示背景
3、背景练习代码部分:
<!DOCTYPE HTML> <html> <head> <title>your title name</title> <meta charset="utf-8"> <meta name="Author" content="Wilson Xu"> <style type="text/css"> *{margin: 0;padding: 0;font-family: "Microsoft yahei";} a{text-decoration: none;} a img{display: block;border: none;} li{list-style: none;} .container{ width: 1200px; padding: 20px; margin: 10px auto; border: 1px dashed #ccc; } .container h4{padding-bottom: 5px;} .container ul{ width: 1200px; overflow: hidden; } .container ul li{ float: left; width: 331px; padding: 20px; height: 240px; margin-right: 10px; border: 10px solid rgba(10,10,10,.3); background: url('images/1.jpg') no-repeat; background-size: 371px auto; } .container ul li:last-child{margin-right: 0;} .container ul.origin li:nth-child(1){ background-origin: border-box; } .container ul.origin li:nth-child(2){ background-origin: padding-box; } .container ul.origin li:nth-child(3){ background-origin: content-box; } .container ul.clip li:nth-child(1){ background-clip: border-box; } .container ul.clip li:nth-child(2){ background-clip: padding-box; } .container ul.clip li:nth-child(3){ background-clip: content-box; } section .pic{ width: 600px; height: 400px; margin: 20px auto; border: 1px dashed #ddd; background: url('images/3.jpg') no-repeat center center/auto 200px, url('images/2.jpg') no-repeat center center/auto 300px, url('images/1.jpg') no-repeat center center/auto 400px; } section p{ font-size: 14px; color: #f01010; } </style> </head> <body> <p class="container"> <section> <h4>1、background-origin: border-box | padding-box | content-box</h4> <ul class="origin"> <li></li> <li></li> <li></li> </ul> </section> <section> <h4 style="margin-top: 20px;border-top: 1px dashed #ccc;">2、background-clip: border-box | padding-box | content-box</h4> <ul class="clip"> <li></li> <li></li> <li></li> </ul> </section> <section> <h4 style="margin-top: 20px;border-top: 1px dashed #ccc;">3、多背景:background: url('images/3.jpg') no-repeat center center/auto 200px, url('images/2.jpg') no-repeat center center/auto 300px, url('images/1.jpg') no-repeat center center/auto 400px; </h4> <p class="pic"></p> <p>注释:复合写background-size的时候,一定要用/与其他值隔开。</p> </section> </p> </body> </html>
5、背景练习preview:
6、渐变:
线性渐变:linear-gradient(方位(left/left top/60deg),起始颜色 | 百分比30%,终止颜色);使用时加内核前缀eg:-webkit-linear-gradient,IE9不支持
径向渐变:radial-gradient(中心点位置,扩散程度,颜色域 | 百分比);由中心向四周发散,eg:-webkit-radial-gradient(50px 50px,起始颜色,终止颜色);-webkit-radial-gradient(center,起始颜色,终止颜色);
IE低版本兼容:filter:progid:DXImageTransform.Microsoft.gradient(startColorstr='#ffffff',endColorstr='#ff0000',GradientType='1');1表示从左到右,0是从上到下,并且颜色值只能是6位哈希值
7、渐变练习代码部分:
<!DOCTYPE HTML> <html> <head> <title>your title name</title> <meta charset="utf-8"> <meta name="Author" content="Wilson Xu"> <style type="text/css"> *{margin: 0;padding: 0;font-family: "Microsoft yahei";} a{text-decoration: none;} a img{display: block;border: none;} li{list-style: none;} .container{ width: 1200px; padding: 20px; margin: 20px auto; border: 1px dashed #ccc; } .container h4{padding-bottom: 5px;} .container ul{ width: 1200px; overflow: hidden; } .container ul.linear li, .container ul.filter li{ width: 600px; height: 40px; margin: 10px 0; } .container ul.linear li:first-child{ background: -webkit-linear-gradient(60deg,#fff 10%, #f00 30%, #0f0 50%, #00f 70%, #000); } .container ul.linear li:last-child{ background: -webkit-linear-gradient(left top, rgba(122,156,233,.6) 30%, rgb(255,12,222) 60%, green 80%, #fff); } .container ul.filter li:first-child{ background: filter:progid:DXImageTransform.Microsoft.gradient(startColorstr='#abcdef',endColorstr='#f44add',GradientType='0'); } .container ul.filter li:last-child{ background: filter:progid:DXImageTransform.Microsoft.gradient(startColorstr='#ffffff',endColorstr='#000000',GradientType='1'); } .container ul.radial li{ width: 200px; height: 200px; margin-right: 20px; float: left; border-radius: 100%; } .container ul.radial li:nth-child(1){ background: -webkit-radial-gradient(center, #fff, #000); } .container ul.radial li:nth-child(2){ background: -webkit-radial-gradient(left 50px, #fff, #000); } .container ul.radial li:nth-child(3){ background: -webkit-radial-gradient(50px 100px,100px 100px, #fff 80%, #000); } .container ul.radial li:nth-child(4){ background: -webkit-radial-gradient(left, #fff 20%, #f00 40%, #0f0 60%, #00f 80%, #000); } </style> </head> <body> <p class="container"> <section> <h4>1、线性渐变:-webkit-linear-gradient(方位,颜色域 | 范围百分比)</h4> <ul class="linear"> <li></li> <li></li> </ul> </section> <section> <h4>2、线性渐变-兼容IE低版本:filter:progid:DXImageTransform.Microsoft.gradient(startColorstr='6位哈希值',endColorstr='6位哈希值',GradientType='1/0');</h4> <ul class="filter"> <li></li> <li></li> </ul> </section> <section> <h4>3、径向渐变:radial-gradient(中心点位置,扩散程度,颜色域 | 百分比);</h4> <ul class="radial"> <li></li> <li></li> <li></li> <li></li> </ul> </section> </p> </body> </html>
8、渐变preview:
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