a.直接切图解决
b.实现适配移动端1px边框，主要是根据设备的dpr来对边框进行缩放处理，CSS写法如下：
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.border-1px{
position: relative;
}
.border-1px::after{
display: block;
position: absolute;
left: 0;
bottom: 0;
width: 100%;
border-bottom: 1px solid rgb(217,217,217);
content: ' ';
}
@media (-webkit-min-device-pixel-ratio: 1.5), (min-device-pixel-ratio: 1.5) {
.border-1px::after {
-webkit-transform: scaleY(0.7);
transform: scaleY(0.7);
}
}
@media (-webkit-min-device-pixel-ratio: 2), (min-device-pixel-ratio: 2) {
.border-1px::after {
-webkit-transform: scaleY(0.5);
transform: scaleY(0.5);
}
}
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