jQuery AJAX“未找到”错误

hello Whenever I click on the button that says "Get External Content" I get a javascript alert that says "Not Found" (this is the error's status text).

Why can it not find the text file I am trying to load via ajax?

This is my folder hierarchy:

--public_html
  --app
    --ajaxTestHome.php
    --ajaxTestText.txt

And this is the file I am trying to load (via ajax) the text file into.

//ajaxTestHome.php
    <!DOCTYPE html>
    <html>
    <head>
    <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
    <script>
    $(document).ready(function(){
      $("#ajax").click(function(){
        $.ajax(
            {
                url:"/app/ajaxTestText.txt", 
                success:function(result){
                    $("#div1").html(result);
                }, 
                error: function(abc) {
                    alert(abc.statusText);
                }, 
                cache: false
            }
        );
      });
    });
    </script>
    </head>
    <body>

    <div id="div1"><h2>Let jQuery AJAX Change This Text</h2></div>

    <button id="ajax">Get External Content</button>
    </body>
    </html>

EDIT: I had a typo in the question. the file is called "ajaxTestText.txt" not "ajaxTestTest.txt"

You shouldn't need the /app/ in the url.

Also your file is called ajaxTestTest.txt and the url you are calling is ajaxTestText.txt they have different names

The URL parameter is incorrect:

$(document).ready(function(){
      $("#ajax").click(function(){
        $.ajax(
            {
                url:"ajaxTestText.txt", 
                success:function(result){
                    $("#div1").html(result);
                }, 
                error: function(abc) {
                    alert(abc.statusText);
                }, 
                cache: false
            }
        );
      });
    });

I found the solution.

The problem did not have anything to do with it being in the wrong directory or me referencing the file with or without the "/" or the "/app/" or "app/".

Rather I changed the extension from .txt to .html. I was accessing this from a server I was FTPing to, and I guess the server won't correctly let you see/access the contents of a txt file but will an HTML? If you happen to know, please enlighten me.