<!doctype html>
<html>
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />
<title>移动h5自适应布局</title>
<style>
/*320px布局*/
html{font-size: 100px;}
body{font-size: 0.14rem;/*实际相当于14px*/}
body{
padding:0;
margin:0;
}
.div2{
font-size:0.14rem;
}
.div3{
width:3rem;
height:3rem;
border:1px solid #000;
box-sizing:border-box;
}
.div4{
margin-top:0.1rem;
width:2rem;
height:2rem;
border:1px solid #000;
box-sizing:border-box;
}
.img1{
width:3.2rem;
}
</style>
</head>
<body>
<div class="div2">动态更改html元素大小</div>
<div class="div3"></div>
<div class="div4"></div>
<img class="img1" src="http://www.baidu.com/img/bdlogo.png" alt="" />
</body>
<script>
// 该代码来自http://www.ghugo.com/mobile-h5-fluid-layout-for-iphone6/
(function (doc, win) {
// 分辨率Resolution适配
var docEl = doc.documentElement,
resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize',
recalc = function () {
var clientWidth = docEl.clientWidth;
if (!clientWidth) return;
docEl.style.fontSize = 100 * (clientWidth / 320) + 'px';
};
// Abort if browser does not support addEventListener
if (!doc.addEventListener) return;
win.addEventListener(resizeEvt, recalc, false);
doc.addEventListener('DOMContentLoaded', recalc, false);
// 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
(function(){
return;
var dpr = scale =1;
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;
//
var 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);
}
})();
})(document, window);
</script>
</html>
