如何使用Flexbox
<ul>
<li></li>
<li></li>
<li></li>
</ul>
上述代码中,ul中三个li,可以将ul称为父元素,li称为子元素。
要使用Flexbox,必须使父元素变成一个Flex容器。只需要显式地设置display:flex;
或display:inline-flex;
即可。
此时子元素就会变成Flex项目。
Flex容器属性
flex-direction
flex-direction: row || column || row-reverse || column-reverse; //行、列和行列的反向
flex-wrap
flex-wrap: wrap || nowrap || wrap-reverse; //换行、不换行、反向换行
flex-flow
flex-flow是flex-direction和flex-wrap两个属性的速记属性。
justify-content
justify-content: flex-start || flex-end || center || space-between || space-around; //左对齐、右对齐、居中、相同间隔、相同空间
align-items
align-items: flex-start || flex-end || center || stretch || baseline; //顶部对齐、底部对齐、垂直居中、使项目和容器高度一致、基线对齐
align-content
align-items: flex-start || flex-end || center || stretch; //顶部对齐、底部对齐、垂直居中、使项目和容器高度一致
Flex项目属性
order
按order的值从小到大排列。
flex-grow和flex-shrink
flex-grow和flex-shrink属性控制Flex项目在容器有多余的空间如何放大(扩展),在没有额外空间又如何缩小。
flex-basis
flex-basis属性可以指定Flex项目的初始大小。
flex
flex是flex-grow、flex-shrink和flex-basis三个属性的速记。
*:flex: 2 1 0 与写为 flex: 2 是一样的,2 表示任何正数。
align-self
align-self: auto || flex-start || flex-end || center || baseline || stretch;
绝对项目和相对项目
绝对Flex项目的宽度只基于 flex 属性,而相对Flex项目的宽度基于内容大小。
Auto-margin对齐
当在Flex项目上使用 margin: auto 时,值为 auto 的方向(左、右或者二者都是)会占据所有剩余空间。
切换flex-direction
如果将 flex-direction 切换为 column,它就不再遵循英语的范式,而是日语的范式,即从右到左为Cross Axis,从上到下为Main Axis。
总结
阅读完原文链接中的文章收获颇多,了解了Flex模型,跟着最后的提示做出了一个相关demo。同时也了解了响应式设计的一点皮毛。
源码
<!DOCTYPE html>
<head>
<meta charset="utf-8">
<title>Catty Music</title>
<link rel="stylesheet" href="flexdemo.css">
<link href="https://cdn.bootcss.com/font-awesome/4.7.0/css/font-awesome.css" rel="stylesheet">
</head>
<body>
<main>
<aside class="sm-hide">
<i class="fa fa-bars"></i>
<i class="fa fa-home"></i>
<i class="fa fa-search"></i>
<i class="fa fa-volume-up"></i>
<i class="fa fa-user"></i>
<i class="fa fa-spotify"></i>
<i class="fa fa-cog"></i>
<i class="fa fa-soundcloud"></i>
</aside>
<section class="content">
<div class="music-head">
<img src="./2.jpg" />
<section class="catty-music">
<div>
<p>CattyBoard Top 100 Single Charts (11.06.36)</p>
<p>Unknown Artist</p>
<p>2016 . Charts . 100 songs</p>
</div>
<div>
<i class="fa fa-play">Play all</i>
<i class="fa fa-plus">Add to</i>
<i class="fa fa-ellipsis-h">More</i>
</div>
</section>
</div>
<ul class="music-list">
<li>
<p>1. One Dance</p>
<p class="sm-hide">Crake feat CatKid & Cyla</p>
<p class="music-time">2:54</p>
<p class="sm-hide"><span class="catty-cloud">CATTY CLOUD SYNC</span></p>
</li>
<li>
<p>2. Panda</p>
<p class="sm-hide">Cattee</p>
<p class="music-time">4:06</p>
<p class="sm-hide"><span class="catty-cloud">CATTY CLOUD SYNC</span></p>
</li>
<li>
<p>3. Can't Stop the Feeling!</p>
<p class="sm-hide">Catin Cimberlake</p>
<p class="music-time">3:56</p>
<p class="sm-hide"><span class="catty-cloud">CATTY CLOUD SYNC</span></p>
</li>
<li>
<p>4. Work From Home</p>
<p class="sm-hide">Cat Harmony feat Colla</p>
<p class="music-time">3:34</p>
<p class="sm-hide"><span class="catty-cloud">CATTY CLOUD SYNC</span></p>
</li>
</ul>
</section>
</main>
<footer>
<div class="music-info">
<img src="./2.jpg" />
<section class="music-info2">
<p>If It Ain't Love</p>
<p>Castson Derulo</p>
</section>
</div>
<div class="music-control">
<i class="fa fa-step-backward"></i>
<i class="fa fa-pause"></i>
<i class="fa fa-forward"></i>
<i class="fa fa-stop-circle"></i>
<i class="fa fa-random"></i>
</div>
</footer>
</body>
</html>
* {
box-sizing: border-box;
}
html,body{
height: 100%;
}
body{
display: flex;
flex-direction: column;
background-color: #fff;
margin: 0;
color: #222;
font-size: .9em;
}
main{
flex: 1 0 auto;
display: flex;
}
aside{
flex: 0 0 40px;
display: flex;
flex-direction: column;
justify-content: space-around;
align-items: center;
background-color: #f2f2f2;
}
aside i.fa{
font-size: .9em;
}
.content{
display: flex;
flex: 1 0 auto;
flex-direction: column;
}
.music-head{
flex: 0 0 280px;
display: flex;
padding: 40px;
background-color: #4e4e4e;
}
.catty-music{
flex: 1 0 auto;
display: flex;
flex-direction: column;
font-weight: 300;
color: #fff;
padding-left: 50px;
}
.catty-music div:nth-child(1){
margin-bottom: auto;
}
.catty-music div:nth-child(2){
margin-top: 0;
}
.catty-music div:nth-child(2) i.fa{
font-size: .9em;
padding: 0 .7em;
font-weight: 300;
}
.catty-music div:nth-child(1) p:first-child{
font-size: 1.8em;
margin: 0 0 10px;
}
.catty-music div:nth-child(1) p:not(:first-child){
font-size: 0.9em;
margin: 2px 0;
}
.music-list{
flex: 1 0 auto;
list-style-type: none;
padding: 5px 10px 0px;
}
li{
display: flex;
padding: 0 20px;
min-height: 50px;
}
li p{
flex: 0 0 25%;
}
li span.catty-cloud{
border: 1px solid black;
font-size: .6em;
padding: 3px;
}
li:nth-child(2n){
background-color: #f2f2f2;
}
footer{
flex: 0 0 90px;
padding: 10px;
color: #fff;
background-color: #BC2F2E;
display: flex;
}
.music-info{
display: flex;
margin-right: auto;
}
.music-control{
display: flex;
justify-content: space-between;
align-items: center;
width: 30%;
}
.music-info img{
width: 90px;
padding-right: 10px;
}
@media screen and (max-width:64em){
.sm-hide{
display: none;
}
.music-head{
flex: 0 0 auto;
display: flex;
flex-direction: column;
align-items: center;
padding: 40px 0;
background-color: #4e4e4e;
}
.catty-music{
text-align: center;
padding: 0;
}
.catty-music div:nth-child(1) p:first-child{
margin: 20px 0;
font-size: 1em;
}
.music-head img{
width: 50%;
margin-bottom: 10px;
}
.music-time{
text-align: right;
}
li p{
flex: 0 0 50%;
}
.music-control{
justify-content: space-around;
}
}
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