html5使用 flexible.js 进行自适应布局
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一.flexible.js
官方js地址:
http://g.tbcdn.cn/mtb/lib-flexible/0.3.4/??flexible_css.js,flexible.js
! function() {
var a = "@charset \"utf-8\";html{color:#000;background:#fff;overflow-y:scroll;-webkit-text-size-adjust:100%;-ms-text-size-adjust:100%}html *{outline:0;-webkit-text-size-adjust:none;-webkit-tap-highlight-color:rgba(0,0,0,0)}html,body{font-family:sans-serif}body,div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,pre,code,form,fieldset,legend,input,textarea,p,blockquote,th,td,hr,button,article,aside,details,figcaption,figure,footer,header,hgroup,menu,nav,section{margin:0;padding:0}input,select,textarea{font-size:100%}table{border-collapse:collapse;border-spacing:0}fieldset,img{border:0}abbr,acronym{border:0;font-variant:normal}del{text-decoration:line-through}address,caption,cite,code,dfn,em,th,var{font-style:normal;font-weight:500}ol,ul{list-style:none}caption,th{text-align:left}h1,h2,h3,h4,h5,h6{font-size:100%;font-weight:500}q:before,q:after{content:''}sub,sup{font-size:75%;line-height:0;position:relative;vertical-align:baseline}sup{top:-.5em}sub{bottom:-.25em}a:hover{text-decoration:underline}ins,a{text-decoration:none}",
b = document.createElement("style");
if(document.getElementsByTagName("head")[0].appendChild(b), b.styleSheet) b.styleSheet.disabled || (b.styleSheet.cssText = a);
else try {
b.innerHTML = a
} catch(c) {
b.innerText = a
}
}();
! function(a, b) {
function c() {
var b = f.getBoundingClientRect().width;
b / i > 540 && (b = 540 * i);
var c = b / 10;
f.style.fontSize = c + "px", k.rem = a.rem = c
}
var d, e = a.document,
f = e.documentElement,
g = e.querySelector('meta[name="viewport"]'),
h = e.querySelector('meta[name="flexible"]'),
i = 0,
j = 0,
k = b.flexible || (b.flexible = {});
if(g) {
console.warn("将根据已有的meta标签来设置缩放比例");
var l = g.getAttribute("content").match(/initial\-scale=([\d\.]+)/);
l && (j = parseFloat(l[1]), i = parseInt(1 / j))
} else if(h) {
var m = h.getAttribute("content");
if(m) {
var n = m.match(/initial\-dpr=([\d\.]+)/),
o = m.match(/maximum\-dpr=([\d\.]+)/);
n && (i = parseFloat(n[1]), j = parseFloat((1 / i).toFixed(2))), o && (i = parseFloat(o[1]), j = parseFloat((1 / i).toFixed(2)))
}
}
if(!i && !j) {
var p = (a.navigator.appVersion.match(/android/gi), a.navigator.appVersion.match(/iphone/gi)),
q = a.devicePixelRatio;
i = p ? q >= 3 && (!i || i >= 3) ? 3 : q >= 2 && (!i || i >= 2) ? 2 : 1 : 1, j = 1 / i
}
if(f.setAttribute("data-dpr", i), !g)
if(g = e.createElement("meta"), g.setAttribute("name", "viewport"), g.setAttribute("content", "initial-scale=" + j + ", maximum-scale=" + j + ", minimum-scale=" + j + ", user-scalable=no"), f.firstElementChild) f.firstElementChild.appendChild(g);
else {
var r = e.createElement("div");
r.appendChild(g), e.write(r.innerHTML)
}
a.addEventListener("resize", function() {
clearTimeout(d), d = setTimeout(c, 300)
}, !1), a.addEventListener("pageshow", function(a) {
a.persisted && (clearTimeout(d), d = setTimeout(c, 300))
}, !1), "complete" === e.readyState ? e.body.style.fontSize = 12 * i + "px" : e.addEventListener("DOMContentLoaded", function() {
e.body.style.fontSize = 12 * i + "px"
}, !1), c(), k.dpr = a.dpr = i, k.refreshRem = c, k.rem2px = function(a) {
var b = parseFloat(a) * this.rem;
return "string" == typeof a && a.match(/rem$/) && (b += "px"), b
}, k.px2rem = function(a) {
var b = parseFloat(a) / this.rem;
return "string" == typeof a && a.match(/px$/) && (b += "rem"), b
}
}(window, window.lib || (window.lib = {}));
使用
<!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></title>
<!--屏幕适配所用-->
<script type="text/javascript" src="../js/flexible.js"></script>
<!--<script src="http://g.tbcdn.cn/mtb/lib-flexible/0.3.4/??flexible_css.js,flexible.js"></script>-->
<style>
.imgsize{
width: 2.7rem; //相当于 200px 比例为 1：75(1rem = 75px)
height: 2.7rem;
}
</style>
</head>
<body>
<div class='g-doc'>
//主体
<img src='image/logo.png' class='imgsize'/>
</div>
</body>
</html>
注意;设置字体大小的时候,尽量不要使用 rem 还是使用 px (更严谨可以参考手淘适配:https://github.com/amfe/article/issues/17)中的方法
rem转px工具:http://www.ofmonkey.com/front/rem
参考:http://caibaojian.com/mobile-responsive.html
手淘适配:https://github.com/amfe/article/issues/17
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