$(function(){
//设置rem
function mobile(){
var size=100, //规定rem与px之间值的转换
maxWidth =750; //设置基准宽度。
ratio = function(){
var r = document.documentElement.clientWidth / maxWidth;
return r>=1?1:r<=0.234?0.234:r;
};
set = function(){
document.documentElement.style.fontSize = ratio() * size +‘px‘;
}();
window.onresize = mobile;
}
mobile();
})

单位px 转换成 rem