53 行
1.6 KiB
JavaScript
可执行文件
53 行
1.6 KiB
JavaScript
可执行文件
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(function(doc, win) {
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// 分辨率Resolution适配
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var docEl = doc.documentElement,
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resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize',
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recalc = function() {
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var clientWidth = docEl.clientWidth;
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if(!clientWidth) return;
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docEl.style.fontSize = 100 * (clientWidth / 720) + 'px'; //注：在720宽度下1rem=100px
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};
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// Abort if browser does not support addEventListener
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if(!doc.addEventListener) return;
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win.addEventListener(resizeEvt, recalc, false);
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doc.addEventListener('DOMContentLoaded', recalc, false);
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// 一物理像素在不同屏幕的显示效果不一样。要根据devicePixelRatio来修改meta标签的scale,要注释上面的meta标签
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(function() {
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return;
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var dpr = scale = 1;
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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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var 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 +
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', 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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})(document, window); |