以后懒得写，直接复制了
var computedFz = (function(){ var designWidth = 375, rem2px = 100; function computedFz(){var fz = Math.floor(window.innerWidth / designWidth * rem2px);document.documentElement.style.fontSize = (fz > 100 ? 100 : fz) + ‘px‘ }return computedFz;})()computedFz();window.onresize = function(){ setTimeout(computedFz,500);}
rem自适应js代码
原文地址：http://www.cnblogs.com/maomao93/p/7455554.html