AJAX返回NaN [关闭]

I am using AJAX call to pass a value to PHP and retrieve a value from PHP. The output i am getting in the console is NaN i am not aware what this means. Please help me rectify this and get the value back using AJAX

Script code:

window['channel']="OVERALL";
     $.ajax({
             method:"GET",
             url:"dash2.php",
             data:({channel:+channel}),
             success:function(data){
                    alert(data);
                    //console.log(data);
                    }
            });

PHP code:

<?php

$channel=$_GET['channel'];

echo json_encode($channel);



?>

NaN mean Not a Number..

why do you have + operator there

data:({channel:+channel}), //here this is trying to convert it into number hence resulting in NAN

it should be

data:({channel:channel}), 

taking a wild guess, it should be(if you are tryto pass that to server side (PHP)

data:{channel: window['channel']},

+channel

+ tries to convert "OVERALL" to number (result is NaN)

Instead of:

data:({channel: +channel}),

Try this:

data:{channel: channel},

Provide JSON datatype and check.

$.ajax({
    type:"GET",
    url:"dash2.php",
    dataType: 'json',
    data:({channel:+channel}),
    success:function(data){
        alert(data);
        //console.log(data);
    }
});