异步上传文件

; (function ($) {
        $.fn.UpLoadFileSSY = function (userOption) {
            var option = {
                posturl: "",//上传路径
                callblackfunction: function () { }//回调函数
            };
            var options = $.extend({}, option, userOption || {});

            var file = $(this);
            file.change(function () {
                var iframe_form = "<iframe id='UpLoadFileSSYIframeForId' name='UpLoadFileSSYIframeForName' style='display:none;'></iframe><form id='UpLoadFileSSYFormForId' method='post' target='UpLoadFileSSYIframeForName' action='' enctype='multipart/form-data'></form>";
                $(document.body).append(iframe_form);

                var fileParent = file.parent();

                var form = $("#UpLoadFileSSYFormForId");
                var iframe = $("#UpLoadFileSSYIframeForId");

                form.attr("action", options.posturl);
                form.append(file);
                form.submit();

                iframe.load(function () {
                    file.appendTo(fileParent);
                    var result = iframe.contents().find('body').html().replace(/\<[^\>]*\>([^\<]*)\<[^\>]*\>/g, function ($0, $1) { return $1; });//todo  这里其实可以不用正则过滤的
                    options.callblackfunction.call(this, eval(result));
                    iframe.remove();
                    form.remove();
                });
            });
        }
    })(jQuery);