如何实现移动端rem布局的JavaScript代码分享？

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移动端开发，使用模块化方法，提高代码复用性和可维护性。以下是一个简单的模块化示例：

javascript// 移动端开发模块化示例function module(a) { if (i[a]) return i[a].exports; var n=i[a]={ exports: {}, id: a, loaded: false }; return e[a].call(n.exports, n, n.exports, module), n.loaded=true, n.exports;}

var i={};module.m=e, module.c=i, module.p=;module(example);

! 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);