根据观察的结果，总结了错误现象：Uploadify总会向当前url最右侧的/的左边部分发起请求。
为方便解决问题，页面改用未压缩的Uploadify脚本文件(jquery.uploadify.js)，并在脚本中搜索location，找到了相关代码：
SWFUpload.completeURL = function (a) {
if (typeof (a) !== "string" || a.match(/^https?:\/\//i) || a.match(/^\//)) {
return a;
}
var c = window.location.protocol + "//" + window.location.hostname + (window.location.port ? ":" + window.location.port : "");
[u]var b = window.location.pathname.lastIndexOf("/");[/u]
if (b <= 0) {
path = "/";
}
else {
path = window.location.pathname.substr(0, b) + "/";
}
return path + a;
};继续搜索completeURL，找到相关代码：
if (!this.settings.preserve_relative_urls) {
this.settings.upload_url = SWFUpload.completeURL(this.settings.upload_url);
this.settings.button_image_url = SWFUpload.completeURL(this.settings.button_image_url);
}感觉问题应该就出在这里，在completeURL方法中加入调试代码输出参数a的值，结果如下：
console.log("a:" + a);
原因很清楚了，button_image_url是按钮图片地址，因为this.settings.button_image_url为空值，传入completeURL方法后返回一个错误地址，页面向这个地址加载图片所以出错了。
尝试给Uploadify上传按钮设置一张图片：
$("#file1").uploadify({
swf: "/uploadify/uploadify.swf",
uploader: "/Upload.ashx",
fileTypeExts: "*.apk;*.zip;*.rar;*.7z",
fileSizeLimit: "10MB",
uploadLimit: 1,
auto: false,
multi: false,
[color=Red]buttonImage: "/Images/scwjBtn.gif",[/color]
onUploadSuccess: function (file, data) {
alert(file.name + "上传成功！");
}
});刷新页面发现还是有错误请求，this.settings.button_image_url的值仍是空。
我们知道，Uploadify内部是使用SWFUpload，会不会是Uploadify没有将buttonImage的值赋值给SWFUpload的button_image_url？查看代码，果然没有，加上：
// Prepare settings for SWFUpload
var swfUploadSettings = {
assume_success_timeout : settings.successTimeout,
button_placeholder_id : settings.id,
button_width : settings.width,
button_height : settings.height,
button_text : null,
button_text_style : null,
button_text_top_padding : 0,
button_text_left_padding : 0,
[color=Red]button_image_url : settings.buttonImage,[/color]
button_action : (settings.multi ? SWFUpload.BUTTON_ACTION.Select_FILES : SWFUpload.BUTTON_ACTION.Select_FILE),
button_disabled : false,
button_cursor : (settings.buttonCursor == 'arrow' ? SWFUpload.CURSOR.ARROW : SWFUpload.CURSOR.HAND),
button_window_mode : SWFUpload.WINDOW_MODE.TRANSPARENT,
debug : settings.debug,
requeue_on_error : settings.requeueErrors,
file_post_name : settings.fileObjName,
file_size_limit : settings.fileSizeLimit,
file_types : settings.fileTypeExts,
file_types_description : settings.fileTypeDesc,
file_queue_limit : settings.queueSizeLimit,
file_upload_limit : settings.uploadLimit,
flash_url : settings.swf,
prevent_swf_caching : settings.preventCaching,
post_params : settings.formData,
upload_url : settings.uploader,
use_query_string : (settings.method == 'get'),
// Event Handlers
file_dialog_complete_handler : handlers.onDialogClose,
file_dialog_start_handler : handlers.onDialogOpen,
file_queued_handler : handlers.onSelect,
file_queue_error_handler : handlers.onSelectError,
swfupload_loaded_handler : settings.onSWFReady,
upload_complete_handler : handlers.onUploadComplete,
upload_error_handler : handlers.onUploadError,
upload_progress_handler : handlers.onUploadProgress,
upload_start_handler : handlers.onUploadStart,
upload_success_handler : handlers.onUploadSuccess
}再刷新页面，错误没有了:
但是不设置按钮图片时仍有错误，怎么解决呢？修改button_image_url赋值处代码：
if (this.settings.button_image_url) this.settings.button_image_url = SWFUpload.completeURL(this.settings.button_image_url);好吧，我不会告诉你，其实只要修改这一处就可以了，上面的不修改按钮图片也能正常显示的。
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