移动端实现边框0.5像素边框

为了在移动端实现0.5像素的实线，以下是个人实践结果

1.通过background-image的渐变效果linear-gradient实现：

<p class="gradient">retina border-bottom 0.5px</p>

.gradient{
    width: 200px;
    height: 20px;
    background-position: left bottom;
    background-image:linear-gradient(to bottom,transparent 50%,#000 50%);
    background-repeat: no-repeat;
    background-size: 100% 1px;
}

效果图：

2.通过border-image的边框背景图实现

<p class="gradient">retina border 0.5px</p>

.gradient{
    width: 240px;
    height: 20px;
    border:1px solid #ddd;
    border-image: url(data:image/gif;base64,R0lGODlhBQAFAIABAN3d3f///yH5BAEAAAEALAAAAAAFAAUAAAIHhB9pGatnCgA7) 2 stretch;
    -webkit-border-image: url(data:image/gif;base64,R0lGODlhBQAFAIABAN3d3f///yH5BAEAAAEALAAAAAAFAAUAAAIHhB9pGatnCgA7) 2 stretch;
}

效果图：

---

0.5像素下边框

.test{
        width: 100%; height: 100px; margin: 0 auto;
        border: 1px solid #ccc;
         border-width: 0 0 1px 0;

        border-image: url('img/border-2.png') 2 stretch;
        -webkit-border-image: url('img/border-2.png') 2 stretch;
        
        /* border-image: url(data:image/gif;base64,R0lGODlhBQAFAIABAN3d3f///yH5BAEAAAEALAAAAAAFAAUAAAIHhB9pGatnCgA7) 2 stretch;
       -webkit-border-image: url(data:image/gif;base64,R0lGODlhBQAFAIABAN3d3f///yH5BAEAAAEALAAAAAAFAAUAAAIHhB9pGatnCgA7) 2 stretch;*/
    }

border-2.png图片为5*5像素png图片