跨源资源共享

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>CORS</title>
</head>
<body>
<script src="../js/jquery.js"></script>
<script>
    //Cross Origin Resource Share 跨域资源共享
    $.get('http://localhost/cors.php',{},function (res) {
        console.log(res);
    });
</script>
</body>
</html>

<?php
    $conn = mysqli_connect('localhost','root','123456','demo');

        $query = mysqli_query($conn,'select * from users');

        while($row = mysqli_fetch_assoc($query)){
            $data[] = $row;
        }

        //
        header('Access-Control-Allow-Origin:*');
        header('Content-Type:application/javascript');
        $result=json_encode($data);