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/**
* YDUI 可伸缩布局方案
* rem计算方式：
*/
! function ( window ) {
/* 设计图文档宽度 */
var docWidth = 750 ;
var doc = window . document ,
docEl = doc . documentElement ,
resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize' ;
var recalc = ( function refreshRem ( ) {
var clientWidth = docEl . getBoundingClientRect ( ) . width ;
/* 8.55： ， ：
docEl . style . fontSize = Math . max ( Math . min ( 20 * ( clientWidth / docWidth ) , 11.2 ) , 8.55 ) * 5 + 'px' ;
return refreshRem ;
} ) ( ) ;
/* 添加倍屏标识，
docEl . setAttribute ( 'data-dpr' , window . navigator . appVersion . match ( /iphone/gi ) ? window . devicePixelRatio : 1 ) ;
if ( /iP(hone|od|ad)/ . test ( window . navigator . userAgent ) ) {
/* 添加IOS标识 */
doc . documentElement . classList . add ( 'ios' ) ;
/* IOS8以上给html添加hairline样式，
if ( parseInt ( window . navigator . appVersion . match ( /OS (\d+)_(\d+)_?(\d+)?/ ) [ 1 ] , 10 ) >= 8 )
doc . documentElement . classList . add ( 'hairline' ) ;
}
if ( ! doc . addEventListener ) return ;
window . addEventListener ( resizeEvt , recalc , false ) ;
doc . addEventListener ( 'DOMContentLoaded' , recalc , false ) ;
} ( window ) ;