scss:

　　

@function a($px, $base-font-size: 100px) {    @if (unitless($px)) {        @warn "Assuming #{$px} to be in pixels, attempting to convert it into pixels for you";        @return a($px + 0px); // That may fail.      } @else if (unit($px) == rem) {        @return $px;      }    @return ($px / $base-font-size) * 1rem;  }

　　

js:

;(function (doc, win, undefined) {    var docEl = doc.documentElement,    resizeEvt = 'orientationchange' in win? 'orientationchange' : 'resize',    recalc = function () {    var clientWidth = docEl.clientWidth;    if (clientWidth === undefined) return;    docEl.style.fontSize = 100 * (clientWidth / 1024) + 'px';//1024==我的设计稿尺寸    };    if (doc.addEventListener === undefined) return;    win.addEventListener(resizeEvt, recalc, false);    doc.addEventListener('DOMContentLoaded', recalc, false)    })(document, window);