成功了，搞了2天。分享一下经验。
首先是把官方的那个例子下载下来，然后照如下的方式修改。
其中tempValue是一个全局变量。
function savetoqiniu() { var uploader = Qiniu.uploader({ runtimes: "html5,flash,html4", browse_button: "setfile", save_key:false, //uptoken: qiniu_uptoken, get_new_uptoken: true, uptoken_func:function() { tempValue=GetFileInfo(); var res = $.ajax({ type: "get", data: { key: tempValue }, url: "/goods/CkeditorGetUploadToken/", async: false }); return JSON.parse(res.responseText).uptoken; }, //uptoken_url: "/goods/CkeditorGetUploadToken?key=" + tempValue, domain: qiniu_bucket_domain, container: "container", max_file_size: "6mb", filters: { mime_types: [{ title: "Image files", extensions: "jpeg,jpg,gif,png,wbmp" }] }, flash_swf_url: "./Moxie.swf", max_retries: 3, dragdrop: true, drop_element: "container", chunk_size: "4mb", auto_start: false, init: { "PostInit": function() { document.getElementById("uploadfile").onclick = function() { //document.getElementById("setfile").style.display = "none"; uploader.start(); return false } }, "FilesAdded": function(up, files) { plupload.each(files, function(file) { document.getElementById("fileinfo").innerHTML += ' ' + file.name + " (" + plupload.formatSize(file.size) + ") "; //var key = Math.round(new Date().getTime() / 1000) + "_" + file.name; //keyQiniuUpload = key; //Test2(); }) }, "BeforeUpload": function (up, file) { }, "UploadProgress": function(up, file) { document.getElementById(file.id).getElementsByTagName("b")[0].innerHTML = "" + file.percent + "%" }, "FileUploaded": function(up, file, info) { var res = JSON.parse(info); var sourceLink = qiniu_bucket_domain + "/" + res.key; document.getElementById(file.id).getElementsByTagName("i")[0].innerHTML = sourceLink; window.CKEDITOR.tools.callFunction(1, sourceLink, 'ok'); }, "Error": function(up, err, errTip) {}, "UploadComplete": function() {}, "Key": function(up, file) { var key = tempValue; console.log(up); return key; } }});} 另外注意一点，就是KEY要传到后台去的，每次的KEY不同。下面是C#代码。
////// 获得CKEDITOR上传凭证 /// ///public ActionResult CkeditorGetUploadToken(string key) { string s= UploadUtil.GetUploadToken("kmsfan",key); if (!string.IsNullOrEmpty(s)) { token token1 = new token(); token1.uptoken = s; s = JsonConvert.SerializeObject(token1); //HttpContext.Response.ContentType = "text/plain"; return Content(s); //return Json(new { uptoken = s}); } return Json(new { IsSuccess = false }); }
网上还没找到类似的解法，我这人不太善于表达，如果有需要的话，不懂的，请在底下留言。