![](https://img.laitimes.com/img/__Qf2AjLwojIjJCLyojI0JCLiAzNfRHLGZkRGZkRfJ3bs92YsYTMfVmepNHL9UFVOVTWU9keJRVT3V1MMBjVtJWd0ckW65UbM5WOHJWa5kHT20ESjBjUIF2X0hXZ0xCMx81dvRWYoNHLrdEZwZ1Rh5WNXp1bwNjW1ZUba9VZwlHdssmch1mclRXY39CXldWYtlWPzNXZj9mcw1ycz9WL49zZuBnL1UTNyEDMxETM4EjMxAjMwIzLc52YucWbp5GZzNmLn9Gbi1yZtl2Lc9CX6MHc0RHaiojIsJye.png)
<style type="text/css">
html {
font-size: 100px;/*根元素font-size的大小 也就是1rem的大小*/
}
div {
background-color: #ccc;
margin-top: 10px;
font-size: 0.16rem;/*根據根元素得,1rem為100px,那0.16rem是16px*/
}
</style>
<style type="text/css">
@media only screen and (max-width: 374px) {
/* iphone5 或者更小的尺寸,以 iphone5 的寬度(320px)比例設定 font-size */
html {
font-size: 86px;
}
}
@media only screen and (min-width: 375px) and (max-width: 413px) {
/* iphone6/7/8 和 iphone x */
html {
font-size: 100px;
}
}
@media only screen and (min-width: 414px) {
/* iphone6p 或者更大的尺寸,以 iphone6p 的寬度(414px)比例設定 font-size */
html {
font-size: 110px;
}
}
body {
font-size: 0.16rem;
}
#div1 {
width: 1rem;
background-color: #ccc;
}
</style>
螢幕預設寬是100vw,長是100vh
#container {
background-color: red;
width: 10vw;
height: 10vh;
}