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/*字体大小控制*/
!function (win, lib) {
var timer,
doc = win.document,
docElem = doc.documentElement,
vpMeta = doc.querySelector('meta[name="viewport"]'),
flexMeta = doc.querySelector('meta[name="flexible"]'),
dpr = 0,
scale = 0,
flexible = lib.flexible || (lib.flexible = {});
// 设置了 viewport meta
if (vpMeta) {
var initial = vpMeta.getAttribute("content").match(/initial\-scale=([\d\.]+)/);
if (initial) {
scale = parseFloat(initial[1]); // 已设置的 initialScale
dpr = parseInt(1 / scale); // 设备像素比 devicePixelRatio
}
}
// 设置了 flexible Meta
else if (flexMeta) {
var flexMetaContent = flexMeta.getAttribute("content");
if (flexMetaContent) {
var initial = flexMetaContent.match(/initial\-dpr=([\d\.]+)/),
maximum = flexMetaContent.match(/maximum\-dpr=([\d\.]+)/);
if (initial) {
dpr = parseFloat(initial[1]);
scale = parseFloat((1 / dpr).toFixed(2));
}
if (maximum) {
dpr = parseFloat(maximum[1]);
scale = parseFloat((1 / dpr).toFixed(2));
}
}
}
// viewport 或 flexible
// meta 均未设置
if (!dpr && !scale) {
var u = (win.navigator.appVersion.match(/androids/gi), win.navigator.appVersion.match(/iphoness/gi)), _dpr = win.devicePixelRatio;
dpr = u ? ((_dpr >= 3 && (!dpr || dpr >= 3)) ? 3 : (_dpr >= 2 && (!dpr || dpr >= 2)) ? 2 : 1) : 1;
scale = 1 / dpr;
}
docElem.setAttribute("data-dpr", dpr);
// 插入 viewport meta
if (!vpMeta) {
vpMeta = doc.createElement("meta");
vpMeta.setAttribute("name", "viewport");
vpMeta.setAttribute("content",
"initial-scale=" + scale + ", maximum-scale=" + scale + ", minimum-scale=" + scale + ", user-scalable=no");
if (docElem.firstElementChild) {
docElem.firstElementChild.appendChild(vpMeta)
} else {
var div = doc.createElement("div");
div.appendChild(vpMeta);
doc.write(div.innerHTML);
}
}
function setFontSize() {
//var d=E.getBoundingClientRect().width;d/B>540&&(d=540*B);var e=d/10;E.style.fontSize=e+"px",z.rem=J.rem=e
var winWidth = docElem.getBoundingClientRect().width;
if (winWidth / dpr > 540) {
(winWidth = 540 * dpr);
}
// 根节点 fontSize 根据宽度决定
var baseSize = winWidth / 10;
docElem.style.fontSize = baseSize + "px";
flexible.rem = win.rem = baseSize;
}
// 调整窗口时重置
win.addEventListener("resize", function () {
clearTimeout(timer);
timer = setTimeout(setFontSize, 300);
}, false);
// orientationchange 时也需要算下
win.addEventListener("orientationchange", function () {
clearTimeout(timer);
timer = setTimeout(setFontSize, 300);
}, false);
// pageshow
// keyword: 倒退 缓存相关
win.addEventListener("pageshow", function (e) {
if (e.persisted) {
clearTimeout(timer);
timer = setTimeout(setFontSize, 300);
}
}, false);
// 设置基准字体
if ("complete" === doc.readyState) {
doc.body.style.fontSize = 12 * dpr + "px";
} else {
doc.addEventListener("DOMContentLoaded", function () {
doc.body.style.fontSize = 12 * dpr + "px";
}, false);
}
setFontSize();
flexible.dpr = win.dpr = dpr;
flexible.refreshRem = setFontSize;
flexible.rem2px = function (d) {
var c = parseFloat(d) * this.rem;
if ("string" == typeof d && d.match(/rem$/)) {
c += "px";
}
return c;
};
flexible.px2rem = function (d) {
var c = parseFloat(d) / this.rem;
if ("string" == typeof d && d.match(/px$/)) {
c += "rem";
}
return c;
}
}(window, window.lib || (window.lib = {}));