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How to close the open alert dialog box in jq or js

I have opened an alert through a callback function, and now I want it to be displayed for a few seconds and then automatically close. How can I do it with jq? js is also possible. If the function is hijacked, it will target all alerts on the current page. I am currently You only need to control one of the alerts, and I beg the front-end master for answers

ps: This is not the point of the question. I am afraid that someone will ask me why I did this...
In addition, I am using this for H5 web Notification. I open the reduced page through Notification's click callback. I don't know how. Writing, I had to use alert to re-maximize the page

var msg = 'test';
var n = new Notification("來(lái)自用戶xxxx的新消息", {  
    icon: 'pic.png',  
    body: '消息內(nèi)容:'+msg  
});  
n.onclick = function() {
    alert(1234);
    //想通過(guò)劫持函數(shù)來(lái)重新定義alert函數(shù)……但是好像是全局的……
    var ALERT_ON = true; 
    var _alert = window.alert;
    window.alert = function(msg) {
        if (ALERT_ON) {
            _alert(msg);
        }
    }
    //location.reload();
    n.close();
};