移动端视口在没设置情况下是980
document.documentElement.clientWidthwindow.screen复制代码
逻辑像素和物理像素
拿iphone4为例，横向逻辑像素为320个，横向物理像素有640个，所以window.devicePixelRatio = 2, 就是2倍屏复制代码
meta标签
<meta name="viewport" content="width=device-width, initial-scale=1.0,maximum-scale=1.0, user-scalable=no">复制代码
移动端1px 解决方案
.radius-border{position: relative;}@media screen and (-webkit-min-device-pixel-ratio: 2){.radius-border:before{content: "";pointer-events: none; /* 防止点击触发 */box-sizing: border-box;position: absolute;width: 200%;height: 200%;left: 0;top: 0;border-radius: 8px;border:1px solid #999;-webkit-transform(scale(0.5));-webkit-transform-origin: 0 0;transform(scale(0.5));transform-origin: 0 0;}}复制代码
flexible.js不要写meta标签，自己会生成
