移动端适配（用js适配rem）

[whkl]

(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);

• 100px=1rem;10px=0.1rem;1px=0.01rem;