rem适配代码：
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;(function(c,d){var e=document.documentElement||document.body,a="orientationchange" in window?"orientationchange":"resize",b=function(){var f=e.clientWidth;e.style.fontSize=(f>=750)?"100px":100*(f/750)+"px"};b();c.addEventListener(a,b,false)})(window);
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>