Created
November 24, 2015 03:57
-
-
Save xiajngsi/451f32e67b711ab99699 to your computer and use it in GitHub Desktop.
适配手机在不同dpr下的高清显示,和完美实现2倍独立像素设计稿。
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
var dpr, rem, scale; | |
var docEl = document.documentElement; | |
var fontEl = document.createElement('style'); | |
var metaEl = document.querySelector('meta[name="viewport"]'); | |
dpr = window.devicePixelRatio || 1; | |
rem = docEl.clientWidth * dpr / 10; | |
scale = 1 / dpr; | |
// 设置viewport,进行缩放,达到高清效果 | |
metaEl.setAttribute('content', 'width=' + dpr * docEl.clientWidth + ',initial-scale=' + scale + ',maximum-scale=' + scale + ', minimum-scale=' + scale + ',user-scalable=no'); | |
// 设置data-dpr属性,留作的css hack之用 | |
docEl.setAttribute('data-dpr', dpr); | |
// 动态写入样式 | |
docEl.firstElementChild.appendChild(fontEl); | |
fontEl.innerHTML = 'html{font-size:' + rem + 'px!important;}'; | |
// 给js调用的,某一dpr下rem和px之间的转换函数 | |
window.rem2px = function(v) { | |
v = parseFloat(v); | |
return v * rem; | |
}; | |
window.px2rem = function(v) { | |
v = parseFloat(v); | |
return v / rem; | |
}; | |
window.dpr = dpr; | |
window.rem = rem; |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment