文章目录 01-浮动-基本使用 02-浮动-产品布局 03-浮动-清除浮动带来的影响 04-清除浮动-额外标签法 05-清除浮动-单伪元素法 06-清除浮动-双伪元素法 07-清除浮动-overflow 08-flex布局-体验 09-flex布局-组成 10-flex布局-主轴对齐方式 11-flex布局-侧轴对齐方式 13-flex布局-修改主轴方向 14-flex布局-弹性伸缩比 15-flex布局-弹性换行 16-flex布局-行对齐方式 17-综合案例-抖音解决方案
< !DOCTYPE html>
< html lang= "en" >
< head> < meta charset= "UTF-8" > < meta name= "viewport" content= "width=device-width, initial-scale=1.0" > < title> Document< / title> < style> / * 特点：顶对齐，具备行内块显示模式特点 * / / * 浮动的盒子会脱离标准流的控制，不再占用原来的位置 * / . one{ width: 100px; height: 100px; background- color: red; float : left; } . two{ width: 200px; height: 200px; background- color: orange; / * float : left; * / / * float : right; * / } < / style>
< / head>
< body> < div class = "one" > < / div> < div class = "two" > < / div>
< / body>
< / html>
Document <div class="product"><div class="left"></div><div class="right"><ul><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li></ul></div>
</div>
< !DOCTYPE html>
< html lang= "en" >
< head> < meta charset= "UTF-8" > < meta name= "viewport" content= "width=device-width, initial-scale=1.0" > < title> Document< / title> < style> . top{ margin: 10px auto; width: 1200px; / * height: 300px; * / background- color: pink; } . left{ float : left; width: 200px; height: 300px; background- color: skyblue; } . right{ float : right; width: 950px; height: 300px; background- color: orange; } . button{ height: 100px; background- color: red; } < / style>
< / head>
< body> < div class = "top" > < div class = "left" > < / div> < div class = "right" > < / div> < / div> < div class = "button" > < / div>
< / body>
< / html>
< !DOCTYPE html>
< html lang= "en" >
< head> < meta charset= "UTF-8" > < meta name= "viewport" content= "width=device-width, initial-scale=1.0" > < title> Document< / title> < style> . top{ margin: 10px auto; width: 1200px; / * height: 300px; * / background- color: pink; } . left{ float : left; width: 200px; height: 300px; background- color: skyblue; } . right{ float : right; width: 950px; height: 300px; background- color: orange; } . button{ height: 100px; background- color: red; } / * 方法一：额外标签法：在父元素内容的最后添加一个块级元素，设置CSS属性clear：both * / . clearfix{ clear: both; } < / style>
< / head>
< body> < div class = "top" > < div class = "left" > < / div> < div class = "right" > < / div> < div class = "clearfix" > < / div> < / div> < div class = "button" > < / div>
< / body>
< / html>
< !DOCTYPE html>
< html lang= "en" >
< head> < meta charset= "UTF-8" > < meta name= "viewport" content= "width=device-width, initial-scale=1.0" > < title> Document< / title> < style> . top{ margin: 10px auto; width: 1200px; / * height: 300px; * / background- color: pink; } . left{ float : left; width: 200px; height: 300px; background- color: skyblue; } . right{ float : right; width: 950px; height: 300px; background- color: orange; } . button{ height: 100px; background- color: red; } / * 单伪元素法 * / / * 伪元素要想生效必须配合content使用 * / . clearfix: : after{ content: "" ; display: block; clear: both; } < / style>
< / head>
< body> < !- - 要使用clearfix只需要在 - - > < div class = "top clearfix" > < div class = "left" > < / div> < div class = "right" > < / div> < / div> < div class = "button" > < / div>
< / body>
< / html>
< !DOCTYPE html>
< html lang= "en" >
< head> < meta charset= "UTF-8" > < meta name= "viewport" content= "width=device-width, initial-scale=1.0" > < title> Document< / title> < style> . top{ margin: 10px auto; width: 1200px; / * height: 300px; * / background- color: pink; } . left{ float : left; width: 200px; height: 300px; background- color: skyblue; } . right{ float : right; width: 950px; height: 300px; background- color: orange; } . button{ height: 100px; background- color: red; } / * 双伪元素法 * / . clearfix: : before, . clearfix: : after{ content: "" ; display: table; } . clearfix: : after{ clear: both; } < / style>
< / head>
< body> < div class = "top clearfix" > < div class = "left" > < / div> < div class = "right" > < / div> < / div> < div class = "button" > < / div>
< / body>
< / html>
/ * 单伪元素法 * /
/ * 伪元素要想生效必须配合content使用 * /
. clearfix: : after{ content: "" ; display: block; clear: both;
} / * 双伪元素法 * /
. clearfix: : before,
. clearfix: : after{ content: "" ; display: table;
}
. clearfix: : after{ clear: both;
}
< !DOCTYPE html>
< html lang= "en" >
< head> < meta charset= "UTF-8" > < meta name= "viewport" content= "width=device-width, initial-scale=1.0" > < title> Document< / title> < style> . top{ margin: 10px auto; width: 1200px; / * height: 300px; * / background- color: pink; / * 方法四：清除浮动：父元素添加CSS属性overflow：hidden * / overflow: hidden; } . left{ float : left; width: 200px; height: 300px; background- color: skyblue; } . right{ float : right; width: 950px; height: 300px; background- color: orange; } . button{ height: 100px; background- color: red; } < / style>
< / head>
< body> < div class = "top" > < div class = "left" > < / div> < div class = "right" > < / div> < / div> < div class = "button" > < / div>
< / body>
< / html>
< !DOCTYPE html>
< html lang= "en" >
< head> < meta charset= "UTF-8" > < meta name= "viewport" content= "width=device-width, initial-scale=1.0" > < title> Document< / title> < style> . box{ display: flex; justify- content: space- between; / * height: 300px; * / border: 1px solid } . box div{ / * float : left; * / / * margin: 50px; * / width: 200px; height: 100px; background- color: pink; } < / style>
< / head>
< body> < div class = "box" > < div> < / div> < div> < / div> < div> < / div> < / div>
< / body>
< / html>
< !DOCTYPE html>
< html lang= "en" >
< head> < meta charset= "UTF-8" > < meta name= "viewport" content= "width=device-width, initial-scale=1.0" > < title> Document< / title> < style> / * box是弹性容器 * / . box{ display: flex; height: 300px; border: 1px solid } / * box 里面的div是弹性盒子：沿着主轴方向排列 * / . box div{ width: 200px; / * 拉伸：跟父级一样 * / / * height: 100px; * / background- color: pink; } / * 主轴：默认水平方向 * / / * 侧轴：垂直方向 * / < / style>
< / head>
< body> < div class = "box" > < !- - 压缩：父级宽度不够了 - - > < div> 1 < / div> < div> 2 < / div> < div> 3 < / div> < div> 1 < / div> < div> 2 < / div> < div> 3 < / div> < / div>
< / body>
< / html>
< !DOCTYPE html>
< html lang= "en" >
< head> < meta charset= "UTF-8" > < meta name= "viewport" content= "width=device-width, initial-scale=1.0" > < title> Document< / title> < style> . box{ display: flex; / * 默认写不写没区别 * / / * justify- content: flex- start; * / / * 弹性盒子终点对齐 * / / * justify- content: flex- end; * / / * 居中 * / / * justify- content: center; * / / * 父级剩余部分分配成间距 * / / * 弹性盒子之间的间距相等 * / justify- content: space- between; / * 间距出现在弹性盒子两侧 * / / * 视觉效果：弹性盒子之间的间距是两端间距的2 倍 * / justify- content: space- around; / * 各个间距都相等 * / justify- content: space- evenly; height: 300px; border: 1px solid } . box div{ height: 100px; width: 200px; background- color: pink; } < / style>
< / head>
< body> < div class = "box" > < div> 1 < / div> < div> 2 < / div> < div> 3 < / div> < / div>
< / body>
< / html>
< !DOCTYPE html>
< html lang= "en" >
< head> < meta charset= "UTF-8" > < meta name= "viewport" content= "width=device-width, initial-scale=1.0" > < title> Document< / title> < style> . box{ display: flex; / * 弹性盒子在侧轴方向没有尺寸才能拉伸，也就是弹性盒子没有height属性 * / / * align- items: stretch; * / / * 弹性盒子排列方式 * / / * align- items: center; * / / * align- items: flex- start; * / / * align- items: flex- end; * / height: 300px; border: 1px solid } / * 对弹性盒子进行设置 * / / * 让第二个盒子侧轴居中对齐 * / . box div: nth- child( 2 ) { align- self: center; } . box div{ width: 200px; height: 100px; background- color: pink; } < / style>
< / head>
< body> < div class = "box" > < div> 1 < / div> < div> 2 < / div> < div> 3 < / div> < / div>
< / body>
< / html>
< !DOCTYPE html>
< html lang= "en" >
< head> < meta charset= "UTF-8" > < meta name= "viewport" content= "width=device-width, initial-scale=1.0" > < title> Document< / title> < style> . box{ display: flex; / * 修改主轴为垂直方向 * / flex- direction: column; / * 主轴垂直居中 * / justify- content: center; / * 侧轴居中，视觉效果：水平居中 * / align- items: center; width: 150px; height: 120px; background- color: pink; } img{ width: 32px; height: 32px; } < / style>
< / head>
< body> < div class = "box" > < img src= "./20.jpg" alt= "" > < span> 媒体< / span> < / div>
< / body>
< / html>
< !DOCTYPE html>
< html lang= "en" >
< head> < meta charset= "UTF-8" > < meta name= "viewport" content= "width=device-width, initial-scale=1.0" > < title> Document< / title> < style> . box{ display: flex; / * 修改主轴方向 * / flex- direction: column; height: 300px; border: 1px solid } . box div{ / * height: 100px; * / background- color: pink; } . box div: nth- child( 1 ) { width: 200px; } / * flex属性是设置弹性盒子（占父级剩余份数）尺寸 * / . box div: nth- child( 2 ) { flex: 1 ; } . box div: nth- child( 3 ) { flex: 2 ; } < / style>
< / head>
< body> < div class = "box" > < div> 1 < / div> < div> 2 < / div> < div> 3 < / div> < / div>
< / body>
< / html>
< !DOCTYPE html>
< html lang= "en" >
< head> < meta charset= "UTF-8" > < meta name= "viewport" content= "width=device-width, initial-scale=1.0" > < title> Document< / title> < style> . box{ display: flex; / * wrap 换行的意思 * / flex- wrap: wrap; / * nowrap是默认值 不换行的意思 * / / * flex- wrap: nowrap; * / justify- content: space- between; height: 300px; border: 1px solid } . box div{ width: 200px; height: 100px; background- color: pink; } < / style>
< / head>
< body> < div class = "box" > < div> 1 < / div> < div> 2 < / div> < div> 3 < / div> < div> 4 < / div> < div> 5 < / div> < div> 6 < / div> < div> 7 < / div> < div> 8 < / div> < div> 9 < / div> < div> 10 < / div> < div> 11 < / div> < div> 12 < / div> < / div>
< / body>
< / html>
< !DOCTYPE html>
< html lang= "en" >
< head> < meta charset= "UTF-8" > < meta name= "viewport" content= "width=device-width, initial-scale=1.0" > < title> Document< / title> < style> . box{ display: flex; flex- wrap: wrap; justify- content: space- between; / * 对一行显示的弹性盒子没有效果 * / / * 调整对齐方式 * / / * align- content: flex- start; * / / * align- content: flex- end; * / / * align- content: space- between; * / / * align- content: space- around; * / / * align- content: space- evenly; * / height: 400px; border: 1px solid } . box div{ width: 200px; height: 100px; background- color: pink; } < / style>
< / head>
< body> < div class = "box" > < div> 1 < / div> < div> 2 < / div> < div> 3 < / div> < div> 4 < / div> < div> 5 < / div> < div> 6 < / div> < div> 7 < / div> < div> 8 < / div> < / div>
< / body>
< / html>
< !DOCTYPE html>
< html lang= "en" >
< head> < meta charset= "UTF-8" > < meta name= "viewport" content= "width=device-width, initial-scale=1.0" > < title> Document< / title> < style> / * 这个案例的布局方式：用一个div嵌套了ul标签，这个ul标签包含了四个li标签四个li标签进行了换行，所以对ul标签设置了弹性换行由于div是完整嵌套ul标签的，所以对ul标签设置了四个方向的内边距由于li标签是靠四个角对齐的，所以对设置主轴对齐方式和行对齐方式* / / * 清除默认样式 * / * { margin: 0 ; padding: 0 ; box- sizing: border- box; } li{ / * 去掉列表前面的小点点 * / list - style: none; } . box li{ display: flex; width: 500px; height: 88px; border: 1px solid } / * 设置外面的大盒子 * / . box{ margin: 50px auto; width: 1200px; height: 418px; border: 1px solid border- radius: 10px; } / * 设置ul标签 * / . box ul{ display: flex; flex- wrap: wrap; justify- content: space- between; align- content: space- between; padding: 90px 40px 90px 60px; height: 418px; } . box . pic img{ height: 85px; width: 84px; } . box . pic { margin- right: 15px; } . box . text h4{ line- height: 40px; font- size: 20px; font- weight: 400 ; color: } . box . text p{ font- size: 14px; color: } < / style>
< / head>
< body> < div class = "box" > < ul> < li> < div class = "pic" > < img src= "./20.jpg" alt= "" > < / div> < div class = "text" > < h4> 换句话说大比分击败< / h4> < p> sajhhbJbsjajjjjj内减< / p> < / div> < / li> < li> < div class = "pic" > < img src= "./20.jpg" alt= "" > < / div> < div class = "text" > < h4> 换句话说大比分击败< / h4> < p> sajhhbJbsjajjjjj内减< / p> < / div> < / li> < li> < div class = "pic" > < img src= "./20.jpg" alt= "" > < / div> < div class = "text" > < h4> 换句话说大比分击败< / h4> < p> sajhhbJbsjajjjjj内减< / p> < / div> < / li> < li> < div class = "pic" > < img src= "./20.jpg" alt= "" > < / div> < div class = "text" > < h4> 换句话说大比分击败< / h4> < p> sajhhbJbsjajjjjj内减< / p> < / div> < / li> < / ul> < / div>
< / body>
< / html>
![蓝桥杯备战18.[蓝桥杯 2021 省 AB] 砝码称重](http://pic.xiahunao.cn/蓝桥杯备战18.[蓝桥杯 2021 省 AB] 砝码称重)
