rem 适配js代码

• 与750px的设计稿进行匹对，根据手机屏幕大小进行动态设置根元素

function remAdapt(){//自适应引入，元素单位用rem

  (function () {

    var b = document.documentElement,

    a = function () {

    var a = b.getBoundingClientRect().width;

    b.style.fontSize = (100/750) * (a >= 750 ? 750 : a) + "px"

    },

    c = null;

    window.addEventListener("resize", function () {

    clearTimeout(c);

    c = setTimeout(a, 300)

    });

    a();

})();



;// }// window.addEventListener("load", remAdapt);