rem适配750

(function (n, e) {

var t = n.documentElement, i = "orientationchange" in window ? "orientationchange" : "resize", d = function () {

var n = t.clientWidth;

n && (t.style.fontSize = n / 7.5 + "px")

};

n.addEventListener && (e.addEventListener(i, d, !1), n.addEventListener("DOMContentLoaded", d, !1))

})(document, window);

// 准基 基于font-size：100px 1rem=100px