手机适配rem

;!function(window){

var win=window,

doc=win.document,

docEle=doc.documentElement,

objhtml=doc.getElementsByTagName('html')[0],

width=docEle.clientWidth,

size='fontSize',

html=function(obj,key,value){return obj.style[key]=value+'px';};

html(objhtml,size,width/7.5);

win.onresize=function(){

var objDoc=win.document,

objDocEle=objDoc.documentElement,

objHtml=objDoc.getElementsByTagName('html')[0],

objWidth=objDocEle.clientWidth;

html(objHtml,size,objWidth/7.5);

};

}(window);