jquery调用php无法正常工作

Hi I am a complete noob in this. I am trying to call a simple php page from js script

$.ajax({
            url: "././mail/testphp.php",
            type: "POST",
            dataType: "html",
            success: function() {
                // Success message
                alert("success");
            },
            error: function(xhr,textStatus,err) {
                alert("readyState: " + xhr.readyState + "
" +
                      "responseText: " + xhr.responseText + "
" +
                      "status: " + xhr.status + "
" +
                      "text status: " + textStatus + "
" +
                      "error: " + err);
            },
        })

This is the testphp:

<?php
echo 'Hello';
?>

The alert I am getting is "NetworkError: Failed to execute send on XMLHttpRequest failed to load file dir/testphp" (the directory is correct).

Both js and php are on my local hard drive. Do I need to put it on a server for it to work or something?

edit: here's the error I am getting (note: the directory IS correct)

Are you loading all files (html and js) from file? (e.i. file://....). If you are loading them through a local webserver, you may face a cross site scripting block from your browser. You can easily find such block if you use google chrome and open the developer tools.

You then can start chrome with a special flag to circumvent this problem (see Chrome Allow File Access From File. However, I reccommend to install a local webserver you can use for testing.

Correct your ajax url :

url: "././mail/testphp.php",

The reason you are getting NetworkError is because your url is not mapping

EDIT

I think this might work

url: "testphp.php",

UPDATED

I think you should add the data to be post like :

url: "testphp.php",
data: "",  // data to be post on testphp.php
type: "POST",

Use this:

url: "../../mail/testphp.php",

instead of this:

url: "././mail/testphp.php",

This would work.

url: '../mail/testphp.php',

. => one dot mean current directory .. => two dots means go up one directory.

either use this url: "../../mail/testphp.php" in order to go up for 2 levels

or use url: "../mail/testphp.php" to go up by 1 level

try any one.