出字淘宝GitHub:https://github.com/amfe/lib-flexible
因为font-size设置为100比较好计算,如果有错误请指出!!!
(function flexible (window, document) {
var docEl = document.documentElement
var dpr = window.devicePixelRatio || 1// adjust body font size
function setBodyFontSize () {
if (document.body) {
document.body.style.fontSize = (12 * dpr) + 'px'
}
else {
document.addEventListener('DOMContentLoaded', setBodyFontSize)
}
}
setBodyFontSize();// set 1rem = viewWidth / 10
function setRemUnit () {
var rem = docEl.clientWidth / 10
docEl.style.fontSize = rem + 'px'
}setRemUnit()
// reset rem unit on page resize
window.addEventListener('resize', setRemUnit)
window.addEventListener('pageshow', function (e) {
if (e.persisted) {
setRemUnit()
}
})// detect 0.5px supports
if (dpr >= 2) {
var fakeBody = document.createElement('body')
var testElement = document.createElement('div')
testElement.style.border = '.5px solid transparent'
fakeBody.appendChild(testElement)
docEl.appendChild(fakeBody)
if (testElement.offsetHeight === 1) {
docEl.classList.add('hairlines')
}
docEl.removeChild(fakeBody)
}
}(window, document))
// 使用教程
// html设置样式font-size:100px;(a)
// 设计稿尺寸750,根据html设置的尺寸得出rem尺寸=标注尺寸/100(a)