php - 想用AJAX做一个二级联动，想请问大神们我代码是否有写错

Question

ajax:代码][2]

html代码：

控制器代码：

页面效果：

Answer 1

Assign variables in the screenshot. I don’t know how think PHP handles it. Let’s write it like this

var _url = "<?=U:(Form.form)?>"

Answer 2

U:(form/form) 要用 <?php ?> Wrap it up.
You can use F12 to see the ajax request details