;(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 = {});
console.log(doc);
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 isOS93 = isIPhone && win.navigator.appVersion.match(/OS 9_3/);
var devicePixelRatio = win.devicePixelRatio;
if (isIPhone && !isOS93) {
// 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;
var height = docEl.getBoundingClientRect().height;
if (width / dpr > 540) {
width = 540 * 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'] = {}));
!function(){
var device = {};
var ua = navigator.userAgent;
var android = ua.match(/(Android);?[\s\/]+([\d.]+)?/);
var ipad = ua.match(/(iPad).*OS\s([\d_]+)/);
var iphone = !ipad && ua.match(/(iPhone\sOS)\s([\d_]+)/);
if (android) {
device.os = 'android';
device.android = true;
device.osVersion = android[2];
device.androidChrome = ua.toLowerCase().indexOf('chrome') >= 0;
}
if (iphone) {
device.os = 'ios';
device.ios = true;
device.osVersion = iphone[2].replace(/_/g, '.');
}
if (device.ios && device.osVersion && ua.indexOf('Version/') >= 0) {
if (device.osVersion.split('.')[0] === '10') {
device.osVersion = ua.toLowerCase().split('version/')[1].split(' ')[0];
}
}
var classNames = [];
device.pixelRatio = window.devicePixelRatio || 1;
classNames.push('pixel-ratio-' + Math.floor(device.pixelRatio));
if (device.pixelRatio >= 2) {
classNames.push('retina');
}
if (device.os) {
classNames.push(device.os, device.os + '-' + device.osVersion.split('.')[0], device.os + '-' + device.osVersion.replace(/\./g, '-'));
if (device.os === 'ios') {
var major = parseInt(device.osVersion.split('.')[0], 10);
for (var i = major - 1; i >= 6; i--) {
classNames.push('ios-gt-' + i);
}
}
}
if (classNames.length > 0) {
document.documentElement.className = classNames.join(' ');
}
}();