Ajax call not working in onbeforeunload event [duplicate]

问题

This question already has an answer here:

How to execute ajax function onbeforeunload? (1 answer)

Closed 5 years ago.

I have functionality in which I need to make a ajax call to update the database value before closing the browser using 'X' button of browser. I have used below code in the header of associated file:

$(document).ready(function() {
     window.onbeforeunload = function(){
        $.ajax('<?php echo base_url();?>index.php/ajax/myfunction?a=4');
     }
});

On closing the browser the function works but ajax call is not executed..

What's the solution?

回答1:

Maybe not the prettiest code but spawning the ajax call in a timeout thread work well cross browser in my experience

$(window).bind("beforeunload", function (e) {
    setTimeout(function(){
        $.ajax({
            type: 'GET',
            async: false,
            url: "[YOUR API CALL]"
        });
    }, 0);
});

Note the last time i used this was on a project using Jquery 1.7

来源：https://stackoverflow.com/questions/15271070/ajax-call-not-working-in-onbeforeunload-event