rem布局移动端按比例缩放通用js

引入
! function(a, b) {
function c() {
var b = f.getBoundingClientRect().width,
c = b / 18.75;
f.style.fontSize = c + “px”, k.rem = a.rem = c
}
var d, e = a.document,
f = e.documentElement,
g = e.querySelector(‘meta[name=“viewport”]’),
h = e.querySelector(‘meta[name=“flexible”]’),
i = 0,
j = 0,
k = b.flexible || (b.flexible = {});
if (g) {
// console.warn(“灏嗘牴鎹凡鏈夌殑meta鏍囩鏉ヨ缃缉鏀炬瘮渚�”);
var l = g.getAttribute(“content”).match(/initial-scale=([\d.]+)/);
l && (j = parseFloat(l[1]), i = parseInt(1 / j))
} else if (h) {
var m = h.getAttribute(“content”);
if (m) {
var n = m.match(/initial-dpr=([\d.]+)/),
o = m.match(/maximum-dpr=([\d.]+)/);
n && (i = parseFloat(n[1]), j = parseFloat((1 / i).toFixed(2))), o && (i = parseFloat(o[1]), j = parseFloat((1 / i).toFixed(2)))
}
}
if (!i && !j) {
var p = (a.navigator.appVersion.match(/android/gi), a.navigator.appVersion.match(/iphone/gi)),
q = a.devicePixelRatio;
i = p ? q >= 3 && (!i || i >= 3) ? 3 : q >= 2 && (!i || i >= 2) ? 2 : 1 : 1, j = 1 / i
}
if (f.setAttribute(“data-dpr”, i), !g)
if (g = e.createElement(“meta”), g.setAttribute(“name”, “viewport”), g.setAttribute(“content”, “initial-scale=” + j + “, maximum-scale=” + j + “, minimum-scale=” + j + “, user-scalable=no”), f.firstElementChild) f.firstElementChild.appendChild(g);
else {
var r = e.createElement(“div”);
r.appendChild(g), e.write(r.innerHTML)
}
a.addEventListener(“resize”, function() { clearTimeout(d), d = setTimeout(c, 300) }, !1), a.addEventListener(“pageshow”, function(a) { a.persisted && (clearTimeout(d), d = setTimeout(c, 300)) }, !1), “complete” === e.readyState ? e.body.style.fontSize = 12 * i + “px” : e.addEventListener(“DOMContentLoaded”, function() { e.body.style.fontSize = 12 * i + “px” }, !1), c(), k.dpr = a.dpr = i, k.refreshRem = c, k.rem2px = function(a) { var b = parseFloat(a) * this.rem; return “string” == typeof a && a.match(/remKaTeX parse error: Expected 'EOF', got '&' at position 4: /) &̲& (b += "px"), …/) && (b += “rem”), b }
}(window, window.lib || (window.lib = {}));
样式中必须包含