在addEventListener更新React状态，渲染界面
作者:
Poppy11 | 来源:发表于
2021-09-03 15:28 被阅读0次useEffect(() => {
document.addEventListener('visibilitychange', log);
}, []);
const log = async () => {
const currentTime = moment(Date.now()).format('YYYY-MM-DD HH:mm:ss');
if (document.visibilityState == 'hidden') {
leaveStartTime = currentTime;
document.title = '离开';
}
if (document.visibilityState == 'visible') {
setLeaveTime(prevLeaveTime => {
return [...prevLeaveTime, { leaveStartTime, endTime: currentTime }];
});
document.title = '回来';
}
};
本文标题：在addEventListener更新React状态，渲染界面
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