如何确保代码在window.location.href之前运行

I have a submit event so that when a form is submitted I make an AJAX API call to POST some information and then I want to run code within that success handler that tracks information in Mixpanel and then redirects the page. I currently have it where the page just redirects by itself without submitting the Mixpanel information.I have a submit event so that when a form is su