H5 监听页面是否被关闭

    var device_type = navigator.userAgent; //获取userAgent信息
    var md = new MobileDetect(device_type); //初始化mobile-detect
    var os = md.os(); //获取系统

    const eventName = os == "iOS" ? "pagehide" : "unload";

    // 监听刷新
    window.addEventListener(eventName, e => {
    
    
      /* do */
      window.localStorage.setItem("你是", new Date());
    });