/**
 * 动态计算根字体大小 页面所有尺寸都用rem写 等比适配手机
 * 750 = 10rem
 * 1rem = 75px
 * */

(function() {
    const  desighWidth = 750;
    const html = document.documentElement;

    function setRem() {
        const width = html.clientWidth;
        const fontSize = width / desighWidth * 100;
        html.style.fontSize = fontSize + 'px';
    }
    setRem();

    window.addEventListener("resize",setRem);

})()