分享一段移动端rem布局js代码

! function(e) {
				function t(a) {
					if(i[a]) return i[a].exports;
					var n = i[a] = {
						exports: {},
						id: a,
						loaded: !1
					};
					return e[a].call(n.exports, n, n.exports, t), n.loaded = !0, n.exports
				}

				var i = {};
				return t.m = e, t.c = i, t.p = "", t(0)
			}([function(e, t) {
				"use strict";
				Object.defineProperty(t, "__esModule", {
					value: !0
				});
				var i = window;
				t["default"] = i.flex = function(e, t) {
					var a = e || 100,
						n = t || 1,
						r = i.document,
						o = navigator.userAgent,
						d = o.match(/Android[\S\s]+AppleWebkit\/(\d{3})/i),
						l = o.match(/U3\/((\d+|\.){5,})/i),
						c = l && parseInt(l[1].split(".").join(""), 10) >= 80,
						p = navigator.appVersion.match(/(iphone|ipad|ipod)/gi),
						s = i.devicePixelRatio || 1;
					p || d && d[1] > 534 || c || (s = 1);
					var u = 1 / s,
						m = r.querySelector('meta[name="viewport"]');
					m || (m = r.createElement("meta"), m.setAttribute("name", "viewport"), r.head.appendChild(m)), m.setAttribute("content", "width=device-width,user-scalable=no,initial-scale=" + u + ",maximum-scale=" + u + ",minimum-scale=" + u), r.documentElement.style.fontSize = a / 2 * s * n + "px"
				}, e.exports = t["default"]
			}]);
			flex(100, 1);