mobile frontend simple rem responsive code
Home Page: https://qdkfweb.cn/simple-flexible.html
License: Apache License 2.0
mobile frontend simple rem responsive code 兼容UC竖屏转横屏，手淘那个lib-flexible.js有bug.可以简单使用我这个。
复制整个文件代码，放在网页的head中。 不需要定义body的font-size值。
PX与REM的转换(区别于手淘版)
1rem = 100px
假如你有一个块是.box{width:120px;height:80px;} 转为rem则为.box{width:1.2rem; height:.8rem;}
生产使用flexible-min.js
在完全适配750px原稿的iphone6机型上数据有误；
var width = docEl.getBoundingClientRect().width;
// width = 370
maxWidth = maxWidth || 540;
width>maxWidth && (width=maxWidth);
var rem = width * 100 / designWidth;
// rem = 50`
该方法没有考虑设备像素比，所有计算值和实际文章称font-size=100px(1rem)不符合；
方案一：强制meta viewport的宽度为设计稿的宽度
把下面的代码放在头部，然后制作稿跟PC上一样的制作就行
// 根据设计稿的宽度来传参 比如640 750 1125
!function(designWidth){
if (/Android(?:\s+|\/)(\d+\.\d+)?/.test(navigator.userAgent)) {
var version = parseFloat(RegExp.$1);
if (version > 2.3) {
var phoneScale = parseInt(window.screen.width) / designWidth;
document.write('<meta name="viewport" content="width=' + designWidth + ',minimum-scale=' + phoneScale + ',maximum-scale=' + phoneScale + ', target-densitydpi=device-dpi">');
} else {
document.write('<meta name="viewport" content="width=' + designWidth + ',target-densitydpi=device-dpi">');
}
} else {
document.write('<meta name="viewport" content="width=' + designWidth + ',user-scalable=no,target-densitydpi=device-dpi,minimal-ui,viewport-fit=cover">');
}
}(750);demo
<!doctype HTML>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8"/>
<meta content="telephone=no" name="format-detection" />
<title>model</title>
<script type="text/javascript">
// 根据设计稿的宽度来传参 比如640 750 1125
!function(e){if(/Android(?:\s+|\/)(\d+\.\d+)?/.test(navigator.userAgent)){var t=parseFloat(RegExp.$1);if(t>2.3){var i=parseInt(window.screen.width)/e;document.write('<meta name="viewport" content="width='+e+",minimum-scale="+i+",maximum-scale="+i+', target-densitydpi=device-dpi">')}else{document.write('<meta name="viewport" content="width='+e+',target-densitydpi=device-dpi">')}}else{document.write('<meta name="viewport" content="width='+e+',user-scalable=no,target-densitydpi=device-dpi,minimal-ui,viewport-fit=cover">')}}(750);
</script>
<style>
body,dl,dd,ul,ol,h1,h2,h3,h4,h5,h6,pre,form,input,textarea,p,hr,thead,tbody,tfoot,th,td{margin:0;padding:0;}
ul,ol{list-style:none;}
a{text-decoration:none;}
html{-ms-text-size-adjust:none;-webkit-text-size-adjust:none;text-size-adjust:none;font-size:32px;}
body{font-size:32px;line-height:1.5;}
body,button,input,select,textarea{font-family:'helvetica neue',tahoma,'hiragino sans gb',stheiti,'wenquanyi micro hei',5FAE8F6F96C59ED1,5B8B4F53,sans-serif;}
b,strong{font-weight:bold;}
i,em{font-style:normal;}
table{border-collapse:collapse;border-spacing:0;}
table th,table td{border:1px solid #ddd;padding:5px;}
table th{font-weight:inherit;border-bottom-width:2px;border-bottom-color:#ccc;}
img{border:0 none;width:auto9;max-width:100%;vertical-align:top;}
button,input,select,textarea{font-family:inherit;font-size:100%;margin:0;vertical-align:baseline;}
button,html input[type="button"],input[type="reset"],input[type="submit"]{-webkit-appearance:button;cursor:pointer;}
button[disabled],input[disabled]{cursor:default;}
input[type="checkbox"],input[type="radio"]{box-sizing:border-box;padding:0;}
input[type="search"]{-webkit-appearance:textfield;-moz-box-sizing:content-box;-webkit-box-sizing:content-box;box-sizing:content-box;}
input[type="search"]::-webkit-search-decoration{-webkit-appearance:none;}
@media screen and (-webkit-min-device-pixel-ratio:0){
input{line-height:normal!important;}
}
select[size],select[multiple],select[size][multiple]{border:1px solid #AAA;padding:0;}
article,aside,details,figcaption,figure,footer,header,hgroup,main,nav,section,summary{display:block;}
audio,canvas,video,progress{display:inline-block;}
</style>
</head>
<body>
<!-- 页面结构写在这里 -->
<!-- 页面结构写在这里 -->
<!-- 页面结构写在这里 -->
<!-- 页面结构写在这里 -->
</body>
</html>方案2：使用淘宝的rem精简版
计算尺寸时，只需要将对应的尺寸除以100。
源码：
(function(designWidth, maxWidth) {
var doc = document,
win = window;
var docEl = doc.documentElement;
var metaEl,
metaElCon;
var styleText,
remStyle = document.createElement("style");
var tid;
function refreshRem() {
// var width = parseInt(window.screen.width); // uc有bug
var width = docEl.getBoundingClientRect().width;
if (!maxWidth) {
maxWidth = 540;
};
if (width > maxWidth) { // 淘宝做法：限制在540的屏幕下，这样100%就跟10rem不一样了
width = maxWidth;
}
var rem = width * 100 / designWidth;
// var rem = width / 10; // 如果要兼容vw的话分成10份 淘宝做法
//docEl.style.fontSize = rem + "px"; //旧的做法，在uc浏览器下面会有切换横竖屏时定义了font-size的标签不起作用的bug
remStyle.innerHTML = 'html{font-size:' + rem + 'px;}';
}
// 设置 viewport ，有的话修改 没有的话设置
metaEl = doc.querySelector('meta[name="viewport"]');
// 20171219修改：增加 viewport-fit=cover ，用于适配iphoneX
metaElCon = "width=device-width,initial-scale=1,maximum-scale=1.0,user-scalable=no,viewport-fit=cover";
if(metaEl) {
metaEl.setAttribute("content", metaElCon);
}else{
metaEl = doc.createElement("meta");
metaEl.setAttribute("name", "viewport");
metaEl.setAttribute("content", metaElCon);
if (docEl.firstElementChild) {
docEl.firstElementChild.appendChild(metaEl);
}else{
var wrap = doc.createElement("div");
wrap.appendChild(metaEl);
doc.write(wrap.innerHTML);
wrap = null;
}
}
//要等 wiewport 设置好后才能执行 refreshRem，不然 refreshRem 会执行2次；
refreshRem();
if (docEl.firstElementChild) {
docEl.firstElementChild.appendChild(remStyle);
} else {
var wrap = doc.createElement("div");
wrap.appendChild(remStyle);
doc.write(wrap.innerHTML);
wrap = null;
}
win.addEventListener("resize", function() {
clearTimeout(tid); //防止执行两次
tid = setTimeout(refreshRem, 300);
}, false);
win.addEventListener("pageshow", function(e) {
if (e.persisted) { // 浏览器后退的时候重新计算
clearTimeout(tid);
tid = setTimeout(refreshRem, 300);
}
}, false);
if (doc.readyState === "complete") {
doc.body.style.fontSize = "16px";
} else {
doc.addEventListener("DOMContentLoaded", function(e) {
doc.body.style.fontSize = "16px";
}, false);
}
})(750, 750);demo
<!doctype HTML>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8"/>
<meta content="telephone=no" name="format-detection" />
<meta name="viewport" content="width=device-width,initial-scale=1,maximum-scale=1.0,user-scalable=no,viewport-fit=cover"/>
<title>lib.flexible 简化版</title>
<script type="text/javascript">
(function(e,t){var i=document,n=window;var l=i.documentElement;var r,a;var d,o=document.createElement("style");var s;function m(){var i=l.getBoundingClientRect().width;if(!t){t=540}if(i>t){i=t}var n=i*100/e;o.innerHTML="html{font-size:"+n+"px;}"}r=i.querySelector('meta[name="viewport"]');a="width=device-width,initial-scale=1,maximum-scale=1.0,user-scalable=no,viewport-fit=cover";if(r){r.setAttribute("content",a)}else{r=i.createElement("meta");r.setAttribute("name","viewport");r.setAttribute("content",a);if(l.firstElementChild){l.firstElementChild.appendChild(r)}else{var c=i.createElement("div");c.appendChild(r);i.write(c.innerHTML);c=null}}m();if(l.firstElementChild){l.firstElementChild.appendChild(o)}else{var c=i.createElement("div");c.appendChild(o);i.write(c.innerHTML);c=null}n.addEventListener("resize",function(){clearTimeout(s);s=setTimeout(m,300)},false);n.addEventListener("pageshow",function(e){if(e.persisted){clearTimeout(s);s=setTimeout(m,300)}},false);if(i.readyState==="complete"){i.body.style.fontSize="16px"}else{i.addEventListener("DOMContentLoaded",function(e){i.body.style.fontSize="16px"},false)}})(750,750);
</script>
<style>
/*
需要注意的是：
样式的reset中需先设置html字体的初始化大小为50px，这是为了防止js被禁用或者加载不到或者执行错误而做的兼容
样式的reset中需先设置body字体的初始化大小为16px，这是为了让body内的字体大小不继承父级html元素的50px，而用系统默认的16px
*/
body,dl,dd,ul,ol,h1,h2,h3,h4,h5,h6,pre,form,input,textarea,p,hr,thead,tbody,tfoot,th,td{margin:0;padding:0;}
ul,ol{list-style:none;}
a{text-decoration:none;}
html{-ms-text-size-adjust:none;-webkit-text-size-adjust:none;text-size-adjust:none;font-size:50px;}
body{line-height:1.5;font-size:16px;}
body,button,input,select,textarea{font-family:'helvetica neue',tahoma,'hiragino sans gb',stheiti,'wenquanyi micro hei',\5FAE\8F6F\96C5\9ED1,\5B8B\4F53,sans-serif;}
b,strong{font-weight:bold;}
i,em{font-style:normal;}
table{border-collapse:collapse;border-spacing:0;}
table th,table td{border:1px solid #ddd;padding:5px;}
table th{font-weight:inherit;border-bottom-width:2px;border-bottom-color:#ccc;}
img{border:0 none;width:auto\9;max-width:100%;vertical-align:top;}
button,input,select,textarea{font-family:inherit;font-size:100%;margin:0;vertical-align:baseline;}
button,html input[type="button"],input[type="reset"],input[type="submit"]{-webkit-appearance:button;cursor:pointer;}
button[disabled],input[disabled]{cursor:default;}
input[type="checkbox"],input[type="radio"]{box-sizing:border-box;padding:0;}
input[type="search"]{-webkit-appearance:textfield;-moz-box-sizing:content-box;-webkit-box-sizing:content-box;box-sizing:content-box;}
input[type="search"]::-webkit-search-decoration{-webkit-appearance:none;}
@media screen and (-webkit-min-device-pixel-ratio:0){
input{line-height:normal!important;}
}
select[size],select[multiple],select[size][multiple]{border:1px solid #AAA;padding:0;}
article,aside,details,figcaption,figure,footer,header,hgroup,main,nav,section,summary{display:block;}
audio,canvas,video,progress{display:inline-block;}
.g-doc{width:7.5rem;margin:0px auto;}
</style>
</head>
<body>
<div class="g-doc">
<!-- 页面结构写在这里 -->
<!-- 页面结构写在这里 -->
<!-- 页面结构写在这里 -->
<!-- 页面结构写在这里 -->
</div>
</body>
</html>想问一下，假如我从美工哪里拿到的psd设计稿尺寸是720像素，设计稿里面的某个元素尺寸为70px * 70px那么我在布局的时候应该怎么给rem值呢？
我是基于1280的宽度开发的 (1280, 750);
我设置了一个宽度12rem 生成的1200pxdiv
如果窗口变成1920 div宽度还是生成的1200px
这是不是错误的？ 还是我哪里设置的有问题呢？
想问一下，为什么要等到viewport 设置好后才能执行 refreshRem，不然 refreshRem 会执行2次；这个怎么验证呢？还有为什么需要去监听pageshow，complete，DOMContentLoaded事件呢？
到底怎么回事 为什么不起作用呢 一下午 本以为是宝 真心气到爆炸
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