<script src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js" type="text/javascript"></script>
<script>
$.ajax({
    type: 'POST',
    url: "http://localhost/bubblewitch/index.php/rpc/ClientApi",
    data: JSON.stringify("[{2:2},{1:1}]"),
    success: function(){},
    dataType: "text",
    contentType: "application/json-rpc",
    timeout:60000,
    error: function(){}
}); 
</script>

$s = fopen("php://input", 'rb');
echo fread($s, 10000);

------解决方案--------------------
当然有：

$s = file_get_contents('php://input');

$s 就是传入的参数


------解决方案--------------------
因为传输协议不合适