8 changed files with 282 additions and 33 deletions
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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.getAttribute('content').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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// iOS下，对于2和3的屏，用2倍的方案，其余的用1倍方案
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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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// 其他设备下，仍旧使用1倍的方案
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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('content', 'initial-scale=' + scale + ', maximum-scale=' + scale + ', minimum-scale=' + scale + ', user-scalable=no'); |
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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('resize', function() { |
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clearTimeout(tid); |
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tid = setTimeout(refreshRem, 300); |
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}, false); |
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win.addEventListener('pageshow', 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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}, false); |
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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('DOMContentLoaded', function(e) { |
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doc.body.style.fontSize = 12 * dpr + 'px'; |
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}, false); |
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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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