|
|
@@ -0,0 +1,125 @@
|
|
|
+
|
|
|
+;(function(win, lib) {
|
|
|
+ var doc = win.document;
|
|
|
+ var docEl = doc.documentElement;
|
|
|
+ var metaEl = doc.querySelector('meta[name="viewport"]');
|
|
|
+ var flexibleEl = doc.querySelector('meta[name="flexible"]');
|
|
|
+ var dpr = 0;
|
|
|
+ var scale = 0;
|
|
|
+ var tid;
|
|
|
+ var flexible = lib.flexible || (lib.flexible = {});
|
|
|
+
|
|
|
+ if (metaEl) {
|
|
|
+ console.warn('将根据已有的meta标签来设置缩放比例');
|
|
|
+ var match = metaEl.getAttribute('content').match(/initial\-scale=([\d\.]+)/);
|
|
|
+ if (match) {
|
|
|
+ scale = parseFloat(match[1]);
|
|
|
+ dpr = parseInt(1 / scale);
|
|
|
+ }
|
|
|
+ } else if (flexibleEl) {
|
|
|
+ var content = flexibleEl.getAttribute('content');
|
|
|
+ if (content) {
|
|
|
+ var initialDpr = content.match(/initial\-dpr=([\d\.]+)/);
|
|
|
+ var maximumDpr = content.match(/maximum\-dpr=([\d\.]+)/);
|
|
|
+ if (initialDpr) {
|
|
|
+ dpr = parseFloat(initialDpr[1]);
|
|
|
+ scale = parseFloat((1 / dpr).toFixed(2));
|
|
|
+ }
|
|
|
+ if (maximumDpr) {
|
|
|
+ dpr = parseFloat(maximumDpr[1]);
|
|
|
+ scale = parseFloat((1 / dpr).toFixed(2));
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ if (!dpr && !scale) {
|
|
|
+ var isAndroid = win.navigator.appVersion.match(/android/gi);
|
|
|
+ var isIPhone = win.navigator.appVersion.match(/iphone/gi);
|
|
|
+ var devicePixelRatio = win.devicePixelRatio;
|
|
|
+ if (isIPhone) {
|
|
|
+ // iOS下，对于2和3的屏，用2倍的方案，其余的用1倍方案
|
|
|
+ if (devicePixelRatio >= 3 && (!dpr || dpr >= 3)) {
|
|
|
+ dpr = 3;
|
|
|
+ } else if (devicePixelRatio >= 2 && (!dpr || dpr >= 2)){
|
|
|
+ dpr = 2;
|
|
|
+ } else {
|
|
|
+ dpr = 1;
|
|
|
+ }
|
|
|
+ } else {
|
|
|
+ // 其他设备下，仍旧使用1倍的方案
|
|
|
+ dpr = 1;
|
|
|
+ }
|
|
|
+ scale = 1 / dpr;
|
|
|
+ }
|
|
|
+
|
|
|
+ docEl.setAttribute('data-dpr', dpr);
|
|
|
+ if (!metaEl) {
|
|
|
+ metaEl = doc.createElement('meta');
|
|
|
+ metaEl.setAttribute('name', 'viewport');
|
|
|
+ metaEl.setAttribute('content', 'initial-scale=' + scale + ', maximum-scale=' + scale + ', minimum-scale=' + scale + ', user-scalable=no');
|
|
|
+ if (docEl.firstElementChild) {
|
|
|
+ docEl.firstElementChild.appendChild(metaEl);
|
|
|
+ } else {
|
|
|
+ var wrap = doc.createElement('div');
|
|
|
+ wrap.appendChild(metaEl);
|
|
|
+ doc.write(wrap.innerHTML);
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ function refreshRem(){
|
|
|
+ var width = docEl.getBoundingClientRect().width;
|
|
|
+ // if (width / dpr > 540) {
|
|
|
+ // // width = 540 * dpr;
|
|
|
+ // width = width * dpr;
|
|
|
+ // }
|
|
|
+ if (width / dpr > 1100) {
|
|
|
+ // width = 540 * dpr;
|
|
|
+ width = width * dpr;
|
|
|
+ } else {
|
|
|
+ width = 1100 * dpr;
|
|
|
+ }
|
|
|
+ var rem = width / 10;
|
|
|
+ docEl.style.fontSize = rem + 'px';
|
|
|
+ flexible.rem = win.rem = rem;
|
|
|
+ }
|
|
|
+
|
|
|
+ win.addEventListener('resize', function() {
|
|
|
+ clearTimeout(tid);
|
|
|
+ tid = setTimeout(refreshRem, 300);
|
|
|
+ }, false);
|
|
|
+ win.addEventListener('pageshow', function(e) {
|
|
|
+ if (e.persisted) {
|
|
|
+ clearTimeout(tid);
|
|
|
+ tid = setTimeout(refreshRem, 300);
|
|
|
+ }
|
|
|
+ }, false);
|
|
|
+
|
|
|
+ if (doc.readyState === 'complete') {
|
|
|
+ doc.body.style.fontSize = 12 * dpr + 'px';
|
|
|
+ } else {
|
|
|
+ doc.addEventListener('DOMContentLoaded', function(e) {
|
|
|
+ doc.body.style.fontSize = 12 * dpr + 'px';
|
|
|
+ }, false);
|
|
|
+ }
|
|
|
+
|
|
|
+
|
|
|
+ refreshRem();
|
|
|
+
|
|
|
+ flexible.dpr = win.dpr = dpr;
|
|
|
+ flexible.refreshRem = refreshRem;
|
|
|
+ flexible.rem2px = function(d) {
|
|
|
+ var val = parseFloat(d) * this.rem;
|
|
|
+ if (typeof d === 'string' && d.match(/rem$/)) {
|
|
|
+ val += 'px';
|
|
|
+ }
|
|
|
+ return val;
|
|
|
+ }
|
|
|
+ flexible.px2rem = function(d) {
|
|
|
+ var val = parseFloat(d) / this.rem;
|
|
|
+ if (typeof d === 'string' && d.match(/px$/)) {
|
|
|
+ val += 'rem';
|
|
|
+ }
|
|
|
+ return val;
|
|
|
+ }
|
|
|
+
|
|
|
+})(window, window['lib'] || (window['lib'] = {}));
|
