媒体查询结合rem实现移动端布局

第一步：先写好重置的样式。直接复制粘贴即可

    @media all and (max-width: 320px){
		html{
			font-size: 12px;
		}
	}
	@media all and (min-width: 321px) and (max-width: 375px){
		html{
			font-size: 14px;
		}
	}
	@media all and (min-width:376px){
		html{
			font-size: 16px;
		}
	}

@charset "utf-8";
html,body,ul,li,ol,dl,dd,dt,p,h1,h2,h3,h4,h5,h6,form,fieldset,legend,img,input,figure,figcaption{margin:0;padding:0;}
section,article,aside,header,footer,main,nav,hgroup{display:block;}
a,u{text-decoration:none;}
em,i{font-style:normal;}
b,strong{font-weight:normal;}
ul,ol,li{list-style:none;}
h1,h2,h3,h4,h5,h6{font-size:16px;font-weight:normal;}
body{font-family: "微软雅黑"}
input{outline:none;}
img{border:0;display:block;}

写移动端另外加上的

*{box-sizing:border-box;}
body,html{height:100%;}
body{display: flex;flex-direction: column;}

在head里，style外需加上下面一句。

<meta name="viewport" content="width=device-width,initial-scale=1.0,minimum-scale=1.0,maximum-scale=1.0,user-scalable=no"/>

第二步：写头部

头部html

    <header>
			<span>热点</span>
			<span>关注</span>
	</header>

头部style

	header{
		height:3.67rem; 
		background: #0dc441;
		display: flex;
		justify-content: center;
		align-items: center;
	}
	header span{
		width: 5.04rem;
		height: 2.04rem;
		background: gray;
		color:#fff;
		text-align: center;
		line-height: 2.04rem;
	}

两个span的共同点写完了，接着分别微调不一样的地方

    header span:nth-child(1){
		border-radius: 1rem 0 0 1rem;
		background: #64d985;
	}
	header span:nth-child(2){
		border-radius: 0 1rem 1rem 0;
		background: #3dd067;	
	}

第三部，写导航nav

导航html。这里的class类名是点击效果。因为还没涉及js，暂时就先写成这样

    <nav>
			<li class="active">足球生活</li>
			<li>足球生活</li>
			<li>足球生活</li>
	</nav>

导航style。因为每个li宽度一样，所以可以给nav定义成弹性盒，然后在主轴分散对齐，侧轴居中对齐。随后做了个点击后变化的效果

	nav{
		height: 2.96rem;
		display: flex;
		background: yellow;
		border-bottom: 1px solid #d9d9d9;
	}
	nav li{
		flex: 1;
		line-height: 2.96rem;
		text-align: center;	
		color:#666666;
	}
	nav li:active{
		color: #0dc441;
		border-bottom: 2px solid #0dc441;
	}

第四部：写底部。因为中间板块的高度不可以固定，所以先写好底部。之后再给中间板块加上flex：1，将剩余空间全分配给它。

底部html

    <footer>
			<div>
				<span class="iconfont icon-wode"></span>
				<i>首页</i>
			</div>
			<div>
				<span class="iconfont icon-wode"></span>
				<i>首页</i>
			</div>
			<div>
				<img src="images/xiangji_03.png" alt="">
			</div>
			<div>
				<span class="iconfont icon-wode"></span>
				<i>首页</i>
			</div>
			<div>
				<span class="iconfont icon-wode"></span>
				<i>首页</i>
			</div>
	</footer>

##底部style

	footer{
			height: 3.625rem;
			background: pink;
		}
	footer{
		display: flex;
		justify-content: space-around;
		border: 1px solid #cbd7cc;
	}
	footer div{
		height: 3.625rem;
		display: flex;
		flex-direction: column;
		align-items: center;
		justify-content: center;

	}
	footer div:nth-child(3){
		position: relative;
	}
	footer div:nth-child(3) img{
		position: absolute;
		bottom: 0;
	}

第五步：写主要内容板块。光给main分配剩余空间还不够，中间板块的内容还是会把头和底挤掉。需得给article也加弹性盒。当写好之后，发现中间板块没法滑动，需得在main那加上overflow：auto

    <main>
		<article>
				<figure>
					<img src="images/03index_0_02.jpg" alt="">
					<figcaption>小丸子啊萌萌哒小丸...</figcaption>
				</figure>
		
		</article>
	</main>

main{
		flex: 1;
		overflow: auto;
	}
	
	main article{
		display: flex;
		flex-wrap: wrap;
		justify-content: space-between;		
	}
	main figure{
		width: 49%;
		display: flex;
		flex-direction: column;
		margin-bottom: 0.4rem;

	}
	main figure img{
		width: 100%;
	}
	main figure figcaption{
		height: 2.5rem;
		border:1px solid #e5e5e5;
		line-height: 2.5rem;
	}

完！