收录一次网易的移动端适配

(function(doc, win) {
var docEl = doc.documentElement,
isIOS = navigator.userAgent.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/),
dpr = isIOS ? Math.min(win.devicePixelRatio, 3) : 1,
dpr = window.top === window.self ? dpr : 1, //被iframe引用时，禁止缩放
dpr = 1,
scale = 1 / dpr,
resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize';
docEl.dataset.dpr = dpr;
var metaEl = doc.createElement('meta');
metaEl.name = 'viewport';
metaEl.content = 'initial-scale=' + scale + ',maximum-scale=' + scale + ', minimum-scale=' + scale;
docEl.firstElementChild.appendChild(metaEl);
var recalc = function() {
let clientHeight = docEl.clientHeight;
let clientWidth = docEl.clientWidth;
doc.getElementsByTagName("html")[0].style.fontSize = 16*clientWidth*6.25/1334 +'px';
clientWidth = 1334 * dpr;
docEl.style.fontSize = 50 * (clientWidth / 1334) + 'px';
};
recalc()
if (!doc.addEventListener) return;
win.addEventListener(resizeEvt, recalc, false);
doc.addEventListener('DOMContentLoaded', recalc, false);
})(document, window);