this is PartialView Code:

@*This PartialView will return by return PartialView()*@
<script>
    alert("OK")
</script>
<h1>test</h1>

this is IActionResult Code:

[HttpPost]
        public IActionResult Test()
        {
            return PartialView("Test");
        }

** Call ActionResult**

let Test = () => {
          
            $.ajax({
                method: 'POST',
                url: "/Home/Test",
                success: function(data, status, xhr) {
                    let itm = document.getElementById("MainPage");
                    itm.innerHTML = data;
                }
            }).done(function(res) {
            }).fail(function(data, status, xhr) {
                
            });
        
}
        </script>

after call javascript Test() function,partialview return successfully but alert("OK") not work