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<>rem与适配
<>rem介绍：
rem的出现解决了em的计算问题，rem的参照物就是根元素（html）的font-size，这让我们对于不同的页面设置全局标准的成为可能。
大屏幕，可以设置大的字体单位，小屏幕设置小的字体单位。一举解决了百分比定位和flex布局的遗留问题。
rem优点：做到了“完美适配”
rem缺点：只是等比放大，小屏下字体小，大屏下字体大。
上面是根据高度来确定字体单位，这里可以用宽度来确定字体单位。
var html = document.getElementsByTagName(“html”);
html[0].style.fontSize = document.documentElement.clientWidth/10+“px”;
<>如何确定字体大小？
第一种比较优雅：媒体查询，我们可以用媒体查询看看浏览设备的宽高，然后设置一个合适的字体单位
第二种方法比较精确，那就是用js去算：
body宽度 document.body.clientWidth
body高度 document.body.clientHeight
布局视口宽度 document.documentElement.clientWidth
布局视口高度 document.documentElement.clientHeight
计算方法：
假设：设计稿高度1500px，设计稿中介绍部分高度300px，倒计时字体大小40px，屏幕高度1000px。
第一步：计算单位：html的font-size = 屏幕高度 / 100 –>10px;
第二步：介绍部分设置成高度30rem。
第三步：字体大小设置成4rem。
优点：全局等比放大的适应
这就意味着，你在6plus里面能看的页面，在iphone4里面同样能看，而且不会因为屏幕小而发生元素交叠的情况，也不会因为屏幕大而出现留白的情况。
