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FormDataでappendしたら''append' called on an object that does not implement interface FormData."とでる理由

More than 5 years have passed since last update.

jqueryを使っているから。
processData: false,
contentType: false,
を設定する。

$.ajax({
    url : "/upload.php",
    type: "POST",
    data : postData,
    processData: false,
    contentType: false,
    success:function(data){
        //success
    },
    error: function(jqXHR, textStatus, errorThrown){
        //fail   
    }
});
bobu_web
おもにフロントエンド系、その流れでiOS、Androidも最近やってます
http://jsfiddle.net/user/nobu222/fiddles/
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