How php responds to ajax request

How does php respond to ajax requests?

Due to a lot of front-end IT, when rendering the page, it needs to be obtained from the background JSON data (of course other types of data can also be obtained) needs to be responded to the front-end page from the background. This is a very simple case of transmitting it to the front-end in PHP array format:

1. JavaScript request:

var container = document.getElementsByClassName('container')[0];
container.onclick = function()
{
    var xhr = new XMLHttpRequest();
    xhr.open('GET','/learn/php_ajax/responseExample.php',true);
    xhr.send();
 
    xhr.onload = function(ev)
    {
        var data = JSON.parse(ev.currentTarget.responseText);
        console.log(data);
    };
}

2. PHP simple background response

The parameters of the ajax request can be obtained through $_GET and $_POST, but there is no corresponding display here.

$array = array("a" => "视频", "b"=>"教2程", "c" => "六");
exit(json_encode($array));

3. Get the results:

{
    a: "视频",
    b: "教2程",
    c: "六"
}

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