ajax 输入不为空,ajax POST响应为空

尝试通过单击按钮发布数据，但作为响应，PHP脚本中将其显示为空

这是html

这是jquery

var action = 1;

$("input").on("click", sendData);

function sendData() {

if ( action == 1 ) {

$("#btn").css("background", "red");

var getData = 1;

$.post({

url: "drain.php",

type: "POST",

data: {"getData" : getData}

});

action = 2;

} else {

$("#btn").css("background", "green");

var getData = 0;

$.post({

url: "drain.php",

type: "POST",

data: {"getData" : getData}

});

action = 1;

}

}

这是我试图接收数据(getData)的PHP脚本

$rcvd_data=filter_input_array(INPUT_GET,[

'data'=>FILTER_SANITIZE_STRING,

'dev_id'=>FILTER_SANITIZE_STRING

]);

if($rcvd_data !== FALSE && !is_null($rcvd_data)) {

$fp=fopen('drain.txt', 'a+');

fwrite($fp, implode(', ', [

0=>date('Y-m-d h:i:s A', time()),

1=>$rcvd_data['data'],

2=>$rcvd_data['dev_id']

]) . PHP_EOL);

}

$getData = $_POST['getData']; // here the posted data is recieved

echo "@".$getData."#";

die();