PHP Script Not Receiving POST Variable sent by JQuery

Question

Here's the code (already imported the JQuery):

$.post("check.php", { username: usr },
    function(result)
    {
        //if the result is 1
        if(result == 1)
        {
            //show that the username is available
            $('#ck_usr_rslt').html(username + ' is Available');
        }
        else
        {
            //show that the username is NOT available
            $('#chk_usr_rslt').html(username + ' is not Available');
        }
});

The thing is, my check.php script keeps throwing the following error:

PHP Notice:  Undefined index: username in /Applications/MAMP/htdocs/RP/check.php on line 23

(Line 23 is when is calls $_POST['username'])

So what's wrong? Could it be the local server I'm running that's the problem? Or is it just some mistake of mine in the JavaScript?

Answer 1

看来“ usr”变量为空（这是JavaScript而不是php），您能否向我们展示如何检索该变量？