移动端1px适配问题
Retina屏幕,设备像素比,移动端的边框在这些屏幕上1px 会表现处2px,3px像素的宽度,所以出现各种解决方案,今天只总结一种,以后慢慢补充。。通过伪类 ::after。,原理就是通过transfrom:scaleX scale scaleY这几个函数进行缩放,废话不多说,直接撸代码,分别是:底边,上边,左边,右边,还有四个边框都有,在文章末尾有相关知识的介绍链接,本文就不会浪费文字在这些方面了。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>移动端1px</title>
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
<style>
div {
text-align: center;
margin: 0 auto;
}
p {
text-align: center;
}
.border-bottom-1px,
.border-top-1px,
.border-left-1px,
.border-right-1px {
width: 50px;
height: 50px;
}
/*移动端1px解决方案*/
.border-1px,
.border-bottom-1px,
.border-top-1px,
.border-left-1px,
.border-right-1px {
width: 100px;
height: 100px;
position: relative;
}
/*线条颜色 黑色*/
.border-bottom-1px::after,
.border-top-1px::after,
.border-left-1px::after,
.border-right-1px::after {
background-color: #000;
}
/*底边边框一像素*/
.border-bottom-1px::after {
content: "";
position: absolute;
left: 0;
bottom: 0;
width: 100%;
height: 1px;
transform-origin: 0 0;
}
/*上边边框一像素*/
.border-top-1px::after {
content: "";
position: absolute;
left: 0;
top: 0;
width: 100%;
height: 1px;
transform-origin: 0 0;
}
/*左边边框一像素*/
.border-left-1px::after {
content: "";
position: absolute;
left: 0;
top: 0;
width: 1px;
height: 100%;
transform-origin: 0 0;
}
/*右边边框1像素*/
.border-right-1px::after {
content: "";
box-sizing: border-box;
position: absolute;
right: 0;
top: 0;
width: 1px;
height: 100%;
transform-origin: 0 0;
}
/*边框一像素*/
.border-1px::after {
content: "";
box-sizing: border-box;
position: absolute;
left: 0;
top: 0;
width: 100%;
height: 100%;
border: 1px solid red;
}
/*设备像素比*/
@media only screen and (-webkit-min-device-pixel-ratio: 2.0),
only screen and (min-resolution: 2dppx) {
.border-bottom-1px::after,
.border-top-1px::after {
transform: scaleY(0.5);
}
.border-left-1px::after,
.border-right-1px::after {
transform: scaleX(0.5);
}
.border-1px::after {
width: 200%;
height: 200%;
transform: scale(0.5);
transform-origin: 0 0;
}
}
/*设备像素比*/
@media only screen and (-webkit-min-device-pixel-ratio: 3.0),
only screen and (min-resolution: 3dppx) {
.border-bottom-1px::after,
.border-top-1px::after {
transform: scaleY(0.333);
}
.border-left-1px::after,
.border-right-1px::after {
transform: scaleX(0.333);
}
.border-1px::after {
width: 300%;
height: 300%;
transform: scale(0.333);
transform-origin: 0 0;
}
}
</style>
</head>
<body>
<p>1, 1px border</p>
<div class="border-1px"></div>
<p>2, 1px left border</p>
<div class="border-left-1px"></div>
<p>3, 1px top border</p>
<div class="border-top-1px"></div>
<p>4, 1px right border</p>
<div class="border-right-1px"></div>
<p>5, 1px bottom border</p>
<div class="border-bottom-1px"></div>
</body>
</html>
如果好奇设备像素比,可以去看张鑫旭老师的博客:设备像素比devicePixelRatio简单介绍
如果好奇其它的解决方案,可以去看另外博客的文章:移动端1px解决方案
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