<!--здесь первая страница-->
<a id="print" href="readjson.php">go</a>
<script>
$(document).ready(function() {
    $('#print').bind("click", getPLFunc);
    });
    function getPLFunc() {
        var a = "tururu";
        //alert (a);
        $.ajax({
            type: "POST",
            url: "readjson.php",
            data: 'str='+a,
            dataType: 'json',
            success: function(data) {
                //alert("ok");
            },
            error: function(data) {
                //alert("not ok");
            }
        });
    }
</script>
---------------------------------
 
<?php
//здесь код readjson.php
$json = isset($_POST['str']) ? $_POST['str'] : 'почему-то не передали str';
echo $json;

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