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end.html
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end.html
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<html style="">
<head>
<meta charset="UTF-8">
<meta content="telephone=no" name="format-detection"/>
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0" />
<title>rem test end</title>
<script>
var h = document.getElementsByTagName('html')[0];
var beforeRootFontSize = window.getComputedStyle(h, null).getPropertyValue('font-size');
var defaultFontSize;
function adapt(designWidth, rem2px){
var d = window.document.createElement('div');
d.style.width = '1rem';
d.style.display = "none";
var head = window.document.getElementsByTagName('head')[0];
head.appendChild(d);
var defaultFontSize = parseFloat(window.getComputedStyle(d, null).getPropertyValue('width'));
// d.remove();
// document.documentElement.style.fontSize = window.innerWidth / designWidth * rem2px / defaultFontSize * 100 + '%';
var st = document.createElement('style');
var portrait = "@media screen and (min-width: "+window.innerWidth+"px) {html{font-size:"+ ((window.innerWidth/(designWidth/rem2px)/defaultFontSize)*100) +"%;}}";
var landscape = "@media screen and (min-width: "+window.innerHeight+"px) {html{font-size:"+ ((window.innerHeight/(designWidth/rem2px)/defaultFontSize)*100) +"%;}}"
st.innerHTML = portrait + landscape;
head.appendChild(st);
return defaultFontSize
};
defaultFontSize = adapt(640, 100);
var afterRootFontSize = window.getComputedStyle(h, null).getPropertyValue('font-size');
</script>
<style>
*,html,body,div,p {
padding:0;
margin: 0;
color: #fff;
line-height:1.5;
}
</style>
</head>
<body>
<div id="bg" style="width:6.4rem;background:rgb(0,86,128);min-height:100%">
<p id="foo" style="width:1rem;height:1rem;font-size:.32rem;background:rgb(255,169,117)">1rem</p>
<div id="font" style="font-size:.32rem"></div>
</div>
<script>
var el = document.getElementById('foo');
var bg = document.getElementById('bg');
var pfontSize = window.getComputedStyle(el, null).getPropertyValue('width');
var bgwidth = window.getComputedStyle(bg, null).getPropertyValue('width');
document.getElementById('font').innerHTML = ''
+ "<br> 设置前html的 fontSize: " + beforeRootFontSize
+ "<br> 设置前1rem的宽度: " + defaultFontSize + "（浏览器默认字体大小精确值）"
+ "<br> html fontSize的设置值: " + h.style.fontSize
+ "<br> 设置后html的 fontSize: " + afterRootFontSize
+ "<br> 1rem 目标值: " + (window.innerWidth/640 * 100)
+ "<br> 1rem 实际值: " + pfontSize
+ "<br> 6.4rem 目标值: " + window.innerWidth + "（屏宽）"
+ "<br> 6.4rem 实际值: " + bgwidth
+ "<br> 6.4rem 计算值: " + (6.4 * (window.innerWidth/640 * 100)) + "（按公式计算）"
+ "<br> 6.4rem 计算值: " + (6.4 * parseFloat(afterRootFontSize)) + "（按设置后html的fontSize计算）"
+ "<br> 6.4rem 计算值: " + (6.4 * (parseFloat(h.style.fontSize)/100) * defaultFontSize) + "（按html fontSize设置值和浏览器默认字体大小精确值计算）"
</script>
</body>
</html>