https://momenta.cn/detail/js/rem.js

1!(function (win, doc) {
2  function setFontSize () {
3    var winWidth = window.innerWidth;
4    var size = (winWidth / 750) * 100;
5    doc.documentElement.style.fontSize = (size < 100 ? size : 100) + 'px';
6    document.documentElement.setAttribute('screen', winWidth < 767 ? 'mobile' : 'pc')
7  }
8
9  var evt = 'onorientationchange' in win ? 'orientationchange' : 'resize';
10
11  var timer = null;
12
13  win.addEventListener(evt, function () {
14    clearTimeout(timer);
15
16    timer = setTimeout(setFontSize, 100);
17  }, false);
18
19  win.addEventListener("pageshow", function (e) {
20    if (e.persisted) {
21      clearTimeout(timer);
22
23      timer = setTimeout(setFontSize, 100);
24    }
25  }, false);
26  // 初始化
27  setFontSize();
28  window.addEventListener("onorientationchange" in window ? "orientationchange" : "resize", function () {
29    setFontSize();
30    
31  }, false);
32}(window, document));