130 lines
3.1 KiB
JavaScript
130 lines
3.1 KiB
JavaScript
/* eslint-disable */
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(function (win, lib) {
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var doc = win.document;
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var docEl = doc.documentElement;
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var metaEl = doc.querySelector('meta[name="viewport"]');
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var flexibleEl = doc.querySelector('meta[name="flexible"]');
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var dpr = 0;
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var scale = 0;
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var tid;
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var flexible = lib.flexible || (lib.flexible = {});
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if (metaEl) {
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console.warn("将根据已有的meta标签来设置缩放比例");
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var match = metaEl
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.getAttribute("content")
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.match(/initial-scale=([d.]+)/);
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if (match) {
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scale = parseFloat(match[1]);
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dpr = parseInt(1 / scale);
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}
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} else if (flexibleEl) {
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var content = flexibleEl.getAttribute("content");
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if (content) {
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var initialDpr = content.match(/initial-dpr=([d.]+)/);
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var maximumDpr = content.match(/maximum-dpr=([d.]+)/);
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if (initialDpr) {
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dpr = parseFloat(initialDpr[1]);
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scale = parseFloat((1 / dpr).toFixed(2));
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}
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if (maximumDpr) {
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dpr = parseFloat(maximumDpr[1]);
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scale = parseFloat((1 / dpr).toFixed(2));
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}
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}
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}
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if (!dpr && !scale) {
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var isAndroid = win.navigator.appVersion.match(/android/gi);
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var isIPhone = win.navigator.appVersion.match(/iphone/gi);
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var devicePixelRatio = win.devicePixelRatio;
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if (isIPhone) {
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if (devicePixelRatio >= 3 && (!dpr || dpr >= 3)) {
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dpr = 3;
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} else if (devicePixelRatio >= 2 && (!dpr || dpr >= 2)) {
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dpr = 2;
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} else {
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dpr = 1;
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}
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} else {
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dpr = 1;
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}
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scale = 1 / dpr;
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}
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docEl.setAttribute("data-dpr", dpr);
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if (!metaEl) {
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metaEl = doc.createElement("meta");
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metaEl.setAttribute("name", "viewport");
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metaEl.setAttribute(
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"content",
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"initial-scale=" +
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scale +
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", maximum-scale=" +
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scale +
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", minimum-scale=" +
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scale +
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", user-scalable=no"
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);
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if (docEl.firstElementChild) {
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docEl.firstElementChild.appendChild(metaEl);
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} else {
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var wrap = doc.createElement("div");
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wrap.appendChild(metaEl);
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doc.write(wrap.innerHTML);
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}
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}
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function refreshRem() {
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var width = docEl.getBoundingClientRect().width;
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if (width / dpr > 540) {
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width = 540 * dpr;
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}
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var rem = width / 10;
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docEl.style.fontSize = rem + "px";
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flexible.rem = win.rem = rem;
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}
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win.addEventListener(
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"resize",
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function () {
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clearTimeout(tid);
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tid = setTimeout(refreshRem, 300);
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},
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false
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);
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win.addEventListener(
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"pageshow",
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function (e) {
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if (e.persisted) {
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clearTimeout(tid);
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tid = setTimeout(refreshRem, 300);
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}
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},
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false
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);
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if (doc.readyState === "complete") {
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doc.body.style.fontSize = 12 * dpr + "px";
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} else {
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doc.addEventListener(
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"DOMContentLoaded",
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function (e) {
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doc.body.style.fontSize = 12 * dpr + "px";
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},
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false
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);
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}
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refreshRem();
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flexible.dpr = win.dpr = dpr;
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flexible.refreshRem = refreshRem;
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flexible.rem2px = function (d) {
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var val = parseFloat(d) * this.rem;
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if (typeof d === "string" && d.match(/rem$/)) {
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val += "px";
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}
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return val;
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};
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flexible.px2rem = function (d) {
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var val = parseFloat(d) / this.rem;
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if (typeof d === "string" && d.match(/px$/)) {
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val += "rem";
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}
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return val;
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};
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})(window, window["lib"] || (window["lib"] = {}));
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