关于css各标签的属性: w3cschool一应俱全
设置固定的图片:
body { background-image: url(bgimage.gif); background-attachment: fixed; }
边框设置属性:
效果:
.c1{ /* 200*200是正方形 */ width: 200px; height: 200px; /*height: 100px;*/ /*border: 10px dashed blue;*/ border-left: 10px dashed green; border-right: 10px dashed red; border-bottom: 10px dashed yellow; border-top: 10px solid purple; border-radius: 50%; /*background: url("xyjy.png") no-repeat;*/ /*溢出的部分隐藏*/ overflow: hidden; } .c1 img{ /*按照父级标签的宽度来展示,并且进行等比缩放*/ max-width: 100%; } <div class="c1"> <img src="xyjy.png" alt=""> </div>
关于div浮动
效果:
div使用float进行浮动,浮动后产生异常需要处理一下,将浮动后外面加上一层
.clearfix:after{ content: ''; display: block; clear: both; }
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <!--<script src="https://cdn.bootcss.com/vue/2.5.17-beta.0/vue.js"></script>--> <!--<script src="https://cdn.bootcss.com/vue-router/3.0.1/vue-router.js"></script>--> <style> .c1{ width: 200px; height: 100px; border: 1px solid black; } .c2{ background-color: red; /*display: none;*/ /*visibility: hidden;*/ } .c3{ background-color: blue; } .c3,.c4{ display: inline-block; } /*.sp1{*/ /*border: 1px solid red;*/ /*display: block;*/ /*width: 100px;*/ /*height: 100px;*/ /*}*/ </style> </head> <body> <div class="c1"> </div> <div class="c1 c2"> </div> <div class="c1 c3"> 我是c3标签 </div> <div class="c1 c4"> 我是c4标签 </div> <!--<span class="sp1">--> <!--我是span1--> <!--</span>--> <!--<span class="sp1">--> <!--我是span2--> <!--</span>--> </body> </html>
定位:返回顶部按钮
效果:
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<head> <meta charset="UTF-8"> <title>Title</title> <!--<script src="https://cdn.bootcss.com/vue/2.5.17-beta.0/vue.js"></script>--> <!--<script src="https://cdn.bootcss.com/vue-router/3.0.1/vue-router.js"></script>--> <style> body{ margin: 0; padding: 0; } .c1,.c2,.c3{ width: 100px; height: 600px; background-color: red; border: 1px solid black ; } /*相对定位*/ /*.c2{*/ /*position: relative;*/ /*left: 102px;*/ /*!*top:-102px;*!*/ /*bottom:102px;*/ /*!*right: ;*!*/ /*}*/ /*绝对定位*/ .c2{ background-color: yellow; position: absolute; height: 100px; left: 60px; top:20px; } .c4{ width: 200px; height: 200px; background-color: pink; position: relative; left: 100px; top:150px; } .back-top{ position: fixed; bottom: 20px; right: 20px; width: 80px; height: 40px; background-color: rgba(255,165,0,0.5); text-align: center; line-height: 40px; border-radius: 5%; } .back-top:hover{ background-color: rgba(255,165,0,1); } .back-top a{ color: white; text-decoration: none; } </style> </head> <body> <a name="top">顶部位置在这里</a> <div class="c1"> c1 </div> <!--测试一下相对定位和绝对定位的组合使用--> <div class="c4"> <div class="c2"> </div> </div> <!--简单测试相对定位和绝对定位的--> <!--<div class="c2">--> <!--c2--> <!--</div>--> <div class="c3"> c3 </div> <span class="back-top"> <a href="#top">返回顶部</a> </span> </body> </html>
溢出:
当文字超过div的大小时,使用overflow:scroll
效果:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <!--<script src="https://cdn.bootcss.com/vue/2.5.17-beta.0/vue.js"></script>--> <!--<script src="https://cdn.bootcss.com/vue-router/3.0.1/vue-router.js"></script>--> <style> div{ width: 200px; height: 200px; border: 1px solid red; overflow: scroll; } </style> </head> <body> <div> 犀一点通. </div> </body> </html>
z-index完成模拟注册对话框
效果
<html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <!--<script src="https://cdn.bootcss.com/vue/2.5.17-beta.0/vue.js"></script>--> <!--<script src="https://cdn.bootcss.com/vue-router/3.0.1/vue-router.js"></script>--> <style> body{ margin: 0; padding: 0; } .content{ height: 600px; width: 600px; border:1px solid blue; background-color: pink; } .shadow{ background-color: black; /*整个标签内容的颜色的透明度*/ opacity: 0.2; position: fixed; width: 100%; height: 900px; top:0; left: 0; color:red; z-index: 900; } .reg{ width: 1000px; height: 360px; background-color: white; border-radius: 5%; position: fixed; top:50%; left: 50%; margin-left:-500px; margin-top: -180px; z-index: 1000; } </style> </head> <body> <div class="content"> 文字 </div> <div class="content"> <a href="">金风玉露一相逢,便胜却人家无数</a> </div>
透明度属性:
rgba设置的是单独属性的透明度
opacity设置的是整个标签的透明度
效果:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <!--<script src="https://cdn.bootcss.com/vue/2.5.17-beta.0/vue.js"></script>--> <!--<script src="https://cdn.bootcss.com/vue-router/3.0.1/vue-router.js"></script>--> <style> .c1,.c2{ width: 100px; height: 100px; /*background-color: red;*/ border: 1px solid red; } /*rgba设置的是单独属性的透明度*/ .c1{ background-color: rgba(255,0,0,0.5); } /*整个标签的透明度设置*/ .c2{ background-color: rgb(255,0,0); opacity: 0.5; } </style> </head> <body> <div class="c1"> xxxxxx </div> <div class="c2"> ssssss </div> </body> </html>