移动适配的几种方案(三种方案)

(function (doc, win) {var docEl = doc.documentElement,resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize',recalc = function () {var clientWidth = docEl.clientWidth;if (!clientWidth) return;docEl.style.fontSize = 100 * (clientWidth / 750) + 'px';};if (!doc.addEventListener) return;win.addEventListener(resizeEvt, recalc, false);doc.addEventListener('DOMContentLoaded', recalc, false);})(document, window);

(function (win) {function setUnitA() {document.documentElement.style.fontSize = document.documentElement.clientWidth / 10 + "px";}var h = null;window.addEventListener("resize", function () { clearTimeout(h); h = setTimeout(setUnitA, 300); }, false);setUnitA();})(window);

html {font-size: 20px;}@media only screen and (min-width: 401px) {html {font-size: 25px !important;}}@media only screen and (min-width: 428px) {html {font-size: 26.75px !important;}}@media only screen and (min-width: 481px) {html {font-size: 30px !important;}}@media only screen and (min-width: 569px) {html {font-size: 35px !important;}}@media only screen and (min-width: 641px) {html {font-size: 40px !important;}}@unit: 40rem;