方法一
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>移动端适配</title>
<meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1, maximum-scale=1.0, minimum-scale=1" id="vp"/>
<script type="text/javascript">
// 计算font-size大小
var wd = document.documentElement.clientWidth*window.devicePixelRatio/10;
document.getElementsByTagName("html")[0].style.fontSize = wd + "px";
// 把屏幕的倍率缩小到N分之一（N是window.devicePixelRatio）
var scale = 1/window.devicePixelRatio;
var mstr = 'initial-scale='+ scale +', maximum-scale='+ scale +', minimum-scale='+ scale +', user-scalable=no';
document.getElementById("vp").content = mstr;
</script>
</head>
<body>
</body>
</html>
方法二
(function (doc, win) {
var docEl = doc.documentElement,
resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize',
recalc = function () {
var clientWidth = docEl.clientWidth;
if (!clientWidth) return;
if (clientWidth >= 900) {
docEl.style.fontSize = '100px';
} else {
docEl.style.fontSize = 100 * (clientWidth / 900) + 'px';
}
var html = document.getElementsByTagName('html')[0];
var settedFs = settingFs = parseInt(100 * (clientWidth / 900));
var whileCount = 0;
while (true) {
var realFs = parseInt(window.getComputedStyle(html).fontSize);
var delta = realFs - settedFs;
//不相等
if (Math.abs(delta) >= 1) {
if (delta > 0)
settingFs--;
else
settingFs++;
html.setAttribute('style', 'font-size:' + settingFs + 'px!important');
} else
break;
if (whileCount++ > 100)
break
}
};
if (!doc.addEventListener) return;
win.addEventListener(resizeEvt, recalc, false);
doc.addEventListener('DOMContentLoaded', recalc, false);
})(document, window);
