尝试使用Jquery将html元素值转换为变量

I have a confirm modal that will delete a user (from XML file), it shows the user name in the confirmation modal, but when i'm trying to get that value to a variable to pass it to php via AJAX, I can't get the value of the html element (span), so I can't pass it to php... when I alert it, its clear.I have a confirm modal that will delete a user