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Correction status：qualified
Teacher's comments：这些练习非常的简单, 但思想却非常重要, 一定要记住, 这样才能在项目中灵活运用
Collection
Collection
一. 将课堂中的全部案例照写一遍, 并达到默写级别
1.设置弹性元素的增长因子
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>设置弹性元素的增长因子</title> <link rel="stylesheet" href="css/style1.css"> </head> <body> <h1>设置弹性元素的增长因子</h1> <h3>（1）、所有元素不增长，以原始宽度显示，增长因子默认值为 0。</h3> <section class="container flex demo1"> <span class="item">item1</span> <span class="item">item2</span> <span class="item">item3</span> </section> <h3>（2）、将剩余空间全部给指定的弹性元素,例子给第三个</h3> <section class="container flex demo2"> <span class="item">item1</span> <span class="item">item2</span> <span class="item">item3</span> </section> <h3>（3）、将剩余空间给不同弹性元素间分配，增长因子支持整数和小数，计算方式不变</h3> <section class="container flex demo3"> <span class="item">item1</span> <span class="item">item2</span> <span class="item">item3</span> </section> <h3>（4）、每个元素宽度不一样的时候，一样使用增长因子分配规律</h3> <section class="container flex demo4"> <span class="item">item1</span> <span class="item">item2</span> <span class="item">item3</span> </section> </body> </html>
点击 "运行实例" 按钮查看在线实例
@import "public.css";
.container{
width:580px;
}
.item{
width: 150px;
}
/*所有元素不增长，以原始宽度显示，增长因子默认值为 0。*/
.demo1 > .item{
flex-grow: 0;
}
/*将剩余空间全部给第三个弹性元素*/
.demo2 > .item:first-of-type{
flex-grow: 0;
}
.demo2 > .item:nth-of-type(2){
flex-grow: 0;
}
.demo2 > .item:last-of-type{
flex-grow: 1;
}
/*增长因子可以是整数也可以是小数*/
.demo3 > .item:first-of-type{
flex-grow: 2;
}
.demo3 > .item:nth-of-type(2){
flex-grow: 2;
}
.demo3 > .item:last-of-type{
flex-grow: 6;
}
/*
剩余空间：580-150*3=130px
增长比例=增长因子/增长因子之和
1.增长比例 0.2
2.增长比例 0.2
3.增长比例 0.6
增长量：
1.130*0.2=26px
2.130*0.2=26px
3.130*0.6=78px
最终宽度：
1.150+26=176
2.150+26=176
3.150+78=228
*/
/*每个元素宽度不一样的时候，一样使用增长因子分配规律*/
.demo4 > .item:first-of-type{
width: 100px;
flex-grow:0.2;
}
.demo4 > .item:nth-of-type(2){
width: 120px;
flex-grow:0.3;
}
.demo4 > .item:last-of-type{
width: 200px;
flex-grow:0.5;
}
/*
剩余空间：580-100-120-200=160px
增长比例=增长因子/增长因子之和
1.增长比例 0.2
2.增长比例 0.3
3.增长比例 0.5
增长量：
1.160*0.2=32px
2.160*0.3=48px
3.160*0.5=80px
最终宽度：
1.100+32=132
2.120+484168
3.200+80=280
*/点击 "运行实例" 按钮查看在线实例
手抄书：
实例效果图：
2.设置弹性元素的缩减因子
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>设置弹性元素的缩减因子</title> <link rel="stylesheet" href="css/style2.css"> </head> <body> <h1>设置弹性元素的缩减因子</h1> <h3>（1）、所有元素不缩减，以原始宽度显示，缩减因子为 0。</h3> <section class="container flex demo1"> <span class="item">item1</span> <span class="item">item2</span> <span class="item">item3</span> </section> <h3>（2）、所有元素自适应容器宽度而且不换行，缩减因子默认值为 1。</h3> <section class="container flex demo2"> <span class="item">item1</span> <span class="item">item2</span> <span class="item">item3</span> </section> <h3>（3）、元素宽度相同，将超出空间给不同弹性元素间分配</h3> <section class="container flex demo3"> <span class="item">item1</span> <span class="item">item2</span> <span class="item">item3</span> </section> <h3>（4）、宽度不同，将超出空间给不同弹性元素间分配</h3> <section class="container flex demo4"> <span class="item">item1</span> <span class="item">item2</span> <span class="item">item3</span> </section> </body> </html>
点击 "运行实例" 按钮查看在线实例
@import "public.css";
.container{
width:350px;
}
.item{
width:150px;
}
/*所有元素不缩减，以原始宽度显示，缩减因子为 0。*/
.demo1 > .item{
flex-shrink: 0;
}
/*
所有元素自适应容器宽度而且不换行，缩减因子默认值为 1。
适用元素宽度相同，缩减因子可以自己设置，计算方式相同
*/
.demo2 > .item{
flex-shrink: 1;
}
/*
超出空间：350-150*3=100px
缩减比例=缩减因子/缩减因子之和
1.缩减比例 0.3333
2.缩减比例 0.3333
3.缩减比例 0.3333
缩减量：
1.100*0.3333=33.33px
2.100*0.3333=33.33px
3.100*0.3333=33.33px
最终宽度：
1.150-33.33=116.67
2.150-33.33=116.67
3.150-33.33=116.67
*/
/*适用元素宽度相同，将超出空间给不同弹性元素间分配，缩减因子支持整数*/
.demo3 > .item:first-of-type{
flex-shrink:1;
}
.demo3 > .item:nth-of-type(2){
flex-shrink:2;
}
.demo3 > .item:last-of-type{
flex-shrink:3;
}
/*
超出空间：350-150*3=100px
缩减比例=缩减因子/缩减因子之和
1.缩减比例 0.1667
2.缩减比例 0.3333
3.缩减比例 0.5
缩减量：
1.100*0.1667=16.67px
2.100*0.3333=33.33px
3.100*0.5=50px
最终宽度：
1.150-16.67=133.33
2.150-33.33=116.67
3.150-50=100
*/
/*宽度不同，将超出空间给不同弹性元素间分配，缩减因子支持整数*/
.demo4 > .item:first-of-type{
width: 160px;
flex-shrink:2;
}
.demo4 > .item:nth-of-type(2){
width: 180px;
flex-shrink:2;
}
.demo4 > .item:last-of-type{
width:200px;
flex-shrink:6;
}
/*
超出空间：160+180+200-350=190px
缩减比例
190/ 160*2+180*2+200*6=0.1
缩减量：
1.190*0.1*2=38px
1.190*0.1*2=38px
1.190*0.1*6=114px
最终宽度：
1.160-38=122
2.180-38=142
3.200-114=86
*/点击 "运行实例" 按钮查看在线实例
手抄书：
实例效果图：
3.设置弹性元素的基准尺寸
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>设置弹性元素的基准尺寸</title> <link rel="stylesheet" href="css/style3.css"> </head> <body> <h1>flex-basis:设置弹性元素的基准尺寸</h1> <h3>1.当弹性元素未设置宽度，以内容宽度显示</h3> <section class="container flex demo1"> <span class="item">item1</span> <span class="item">item2</span> <span class="item">item3</span> </section> <h3>2.当弹性元素设置宽度，以该宽度显示</h3> <section class="container flex demo2"> <span class="item">item1</span> <span class="item">item2</span> <span class="item">item3</span> </section> <h3>3.auto状态下，根据浏览器自行判定</h3> <section class="container flex demo3"> <span class="item">item1</span> <span class="item">item2</span> <span class="item">item3</span> </section> <h3>4.当弹性元素既有自定义宽度，也有基准宽度，以基准尺寸为准</h3> <section class="container flex demo4"> <span class="item">item1</span> <span class="item">item2</span> <span class="item">item3</span> </section> <h3>5.弹性元素支持百分比宽度</h3> <section class="container flex demo5"> <span class="item">item1</span> <span class="item">item2</span> <span class="item">item3</span> </section> </body> </html>
点击 "运行实例" 按钮查看在线实例
@import "public.css";
.container{
width: 500px;
}
/*弹性元素未设置宽度，以内容宽度显示*/
.demo1 > .item{
flex-basis: content;
}
/*当弹性元素设置宽度，以该宽度显示*/
.demo2 > .item{
width: 130px;
}
/*3.auto情况下，根据浏览器自行判断*/
.demo3 > .item{
flex-basis: auto;
}
/*当弹性元素既有自定义宽度，也有基准宽度，以基准尺寸为准*/
.demo4 > .item{
width: 150px;
flex-basis: 120px;
}
/*弹性元素支持百分比宽度*/
.demo5 > .item:first-of-type{
flex-basis: 10%;
}
.demo5 > .item:nth-of-type(2){
flex-basis: 30%;
}
.demo5 > .item:last-of-type{
flex-basis: 60%;
}点击 "运行实例" 按钮查看在线实例
手抄书：
实例效果图：
4.flex的简写
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>flex的简写</title> <link rel="stylesheet" href="css/style4.css"> </head> <body> <h1>flex的简写</h1> <h3>1.根据宽度计算，允许缩减适合弹性容器</h3> <section class="container flex demo1"> <span class="item">item1</span> <span class="item">item2</span> <span class="item">item3</span> </section> <h3>2.根据宽度计算，自适应弹性容器</h3> <section class="container flex demo2"> <span class="item">item1</span> <span class="item">item2</span> <span class="item">item3</span> </section> <h3>3.失去弹性，以原始宽度显示</h3> <section class="container flex demo3"> <span class="item">item1</span> <span class="item">item2</span> <span class="item">item3</span> </section> <h3>4.只有一个数值的时候 表示增长因子</h3> <section class="container flex demo4"> <span class="item">item1</span> <span class="item">item2</span> <span class="item">item3</span> </section> <h3>5.有三个数值，元素宽度以它为准</h3> <section class="container flex demo5"> <span class="item">item1</span> <span class="item">item2</span> <span class="item">item3</span> </section> <h3>6.单独设置元素的大小</h3> <section class="container flex demo6"> <span class="item">item1</span> <span class="item">item2</span> <span class="item">item3</span> </section> </body> </html>
点击 "运行实例" 按钮查看在线实例
@import "public.css";
.container{
width: 500px;
}
/*简写格式：
flex: [ <'flex-grow'> <'flex-shrink'> || <'flex-basis'> */
.demo1 > .item{
width: 120px;
height: 50px;
/*flex:0 1 auto;*/
flex: initial;
}
.demo2 > .item{
width: 120px;
height: 50px;
/*flex:1 1 auto;*/
flex: auto;
}
.demo3 > .item{
width: 120px;
height: 50px;
/*flex:0 0 auto;*/
flex: none;
}
.demo4 > .item{
width: 120px;
height: 50px;
flex:1;
}
.demo5 > .item{
width: 120px;
height: 50px;
flex:1 0 200px;
}
.demo6 > .item:first-of-type{
flex:0 1 50%;
}点击 "运行实例" 按钮查看在线实例
手抄书：
实例效果图：
二.. 将flex属性的用法, 手抄, 建议二遍以上
三. 自学:align-self, order的用法
order属性
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>弹性元素之order属性</title> <link rel="stylesheet" href="css/style5.css"> </head> <body> <h3>1.order属性定义项目的排列顺序。数值越小，排列越靠前，默认为0。</h3> <section class="container flex demo1"> <span class="item">item1</span> <span class="item">item2</span> <span class="item">item3</span> <span class="item">item4</span> </section> <h3>2.order属性定义项目的排列顺序。数值越小，排列越靠前，支持负数</h3> <section class="container flex demo2"> <span class="item">item1</span> <span class="item">item2</span> <span class="item">item3</span> <span class="item">item4</span> </section> </body> </html>
点击 "运行实例" 按钮查看在线实例
@import "public.css";
.container{
width: 500px;
}
.demo1 > .item:first-of-type{
order: 3;
}
.demo1 > .item:nth-of-type(2){
order: 2;
}
.demo1 > .item:nth-of-type(3){
order: 4;
}
.demo1 > .item:last-of-type{
order: 1;
}
.demo2 > .item:first-of-type{
order: -3;
}
.demo2 > .item:nth-of-type(2){
order: -8;
}
.demo2 > .item:nth-of-type(3){
order: 3;
}
.demo2 > .item:last-of-type {
order: 2;
}点击 "运行实例" 按钮查看在线实例
手抄书：
实例效果图：
2.align-self属性
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>弹性元素之align-self属性</title> <link rel="stylesheet" href="css/style6.css"> </head> <body> <h1>align-self属性</h1> <h3>1.align-self属性允许单个项目有与其他项目不一样的对齐方式,<br>默认值为auto，表示继承父元素的align-items属性，<br>如果没有父元素，则等同于stretch。</h3> <section class="container flex demo1"> <span class="item">item1</span> <span class="item">item2</span> <span class="item">item3</span> <span class="item">item4</span> <span class="item">item5</span> <span class="item">item6</span> </section> </body> </html>
点击 "运行实例" 按钮查看在线实例
@import "public.css";
.container{
width: 500px;
height: 100px;
}
/*align-self: auto/flex-start/flex-end/center/baseline/ stretch;*/
.demo1 > .item:first-of-type{
align-self: flex-start;
}
.demo1 > .item:nth-of-type(2){
align-self: flex-end;
}
.demo1 > .item:nth-of-type(3){
align-self:center;
}
.demo1 > .item:nth-of-type(4){
align-self:baseline;
}
.demo1 > .item:nth-of-type(5){
align-self:stretch;
}
.demo1 > .item:last-of-type{
align-self:auto;
}点击 "运行实例" 按钮查看在线实例
手抄书：
实例效果图：
四. 试着将之前的一些案例用flex布局改定, 例如圣杯布局
实例HTML
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>圣杯布局改flex布局</title> <link rel="stylesheet" href="css/style7.css"> </head> <body> <header>头部</header> <main> <article>主体内容区</article> <aside>左边栏</aside> <aside>右边栏</aside> </main> <footer>底部</footer> </body> </html>
点击 "运行实例" 按钮查看在线实例
body,main{
display: flex;
}
body{
flex-direction:column;
}
header,footer{
background: #2f89c5;
height: 80px;
}
main{
flex-flow:row nowrap;
}
main > aside{
width: 200px;
min-height: 600px;
background: darkseagreen;
}
main > article{
flex:1;
order: 2;
background: #c5323e;
min-height: 600px;
}
main > aside:first-of-type{
order: 1;
}
main > aside:last-of-type{
order: 3;
}点击 "运行实例" 按钮查看在线实例
手抄书：
实例效果图：
