js 抓取屏幕宽度设置字体大小 rem

var doc = window.document
?var docEl = doc.documentElement
?var tid

?function refreshRem () {
???var width = docEl.getBoundingClientRect().width
???if (width > 540) { // 最大宽度
?????width = 540
???}
???var rem = width / 7.5 // 将屏幕宽度分成750份，1份为1rem 375屏刚好0.5px
???docEl.style.fontSize = rem + ‘px‘
?}

?window.addEventListener(‘resize‘, function () {
???clearTimeout(tid)
???tid = setTimeout(refreshRem, 300)
?}, false)
?window.addEventListener(‘pageshow‘, function (e) {
???if (e.persisted) {
?????clearTimeout(tid)
?????tid = setTimeout(refreshRem, 300)
???}
?}, false)

?refreshRem()

js 抓取屏幕宽度设置字体大小 rem

原文地址：http://www.cnblogs.com/adouwt/p/7794665.html