rtk-wms-uniapp/components/global/rem.js

function remSize() {
    // 获取设备宽度, 设置rem
    let deviceWidth = document.documentElement.clientWidth || window.innerWidth;
    if (deviceWidth >= 750) {
        deviceWidth = 750;
    } else if (deviceWidth <= 320) {
        deviceWidth = 320;
    }
    // 750px --> 1rem = 100px, 375px --> 1rem = 50px
    document.documentElement.style.fontSize = (deviceWidth / 7.5) + "px";
    // 设置字体大小, 默认15px
    document.querySelector('body').style.fontSize = 0.3 + "rem";
}
remSize();
// 当窗口发生变化调用
window.onresize = function () {
    remSize();
}