这是我在index.html上的代码:
<html>
<head>
<title>TODO supply a title</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width">
<script src="//ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
<script>
$.ajax({
type: "POST",
url: 'test.php',
data: "check",
success: function(data){
alert(data);
}
});
</script>
</head>
<body>
<div></div>
</body>
</html>
如何编写test.php以获取在AJAX API中发送的"数据"？