ajax

<script type="text/javascript">
    var str = '{"name":"john"}';
    var obj = $.parseJSON(str);
    $.ajax({
        type:'POST',
        url: url,
        contentType: "application/json;charset=utf-8",
        datatype: "json",
        data: obj,
        async: false,
        success:function(){
            alert('success');
        },
        error:function(){
            alert('error');
        }
    })
</script>