UEditor单图上传（simpleupload）跨域问题解决方案

代码实现

首先我们需要在 ueditor.all.js 文件中找到原本的单图上传部分的代码

搜索关键字 simpleupload，如下图所示：

然后找到上传图片的代码片段，如下图所示：

然后把 domUtils.on 的 input 绑定的事件注释掉或删除掉

替换成以下代码:

            input.onchange = function () {
                if (!input.value) return;
                var loadingId = "loading_" + (+new Date()).toString(36);
                var params =
                    utils.serializeParam(me.queryCommandValue("serverparam")) || "";

                var imageActionUrl = me.getActionUrl(me.getOpt("imageActionName"));
                var imageUrlPrefix = me.getOpt("imageUrlPrefix");
                var allowFiles = me.getOpt("imageAllowFiles");

                me.focus();
                me.execCommand(
                    "inserthtml",
                    '<img class="loadingclass" id="' +
                    loadingId +
                    '" src="' +
                    me.options.themePath +
                    me.options.theme +
                    '/images/spacer.gif">'
                );
                /* 判断后端配置是否没有加载成功 */
                if (!me.getOpt("imageActionName")) {
                    errorHandler(me.getLang("autoupload.errorLoadConfig"));
                    return;
                }
                // 判断文件格式是否错误
                var filename = input.value,
                    fileext = filename ? filename.substr(filename.lastIndexOf(".")) : "";
                if (
                    !fileext ||
                    (allowFiles &&
                        (allowFiles.join("") + ".").indexOf(fileext.toLowerCase() + ".") ==
                        -1)
                ) {
                    showErrorLoader(me.getLang("simpleupload.exceedTypeError"));
                    return;
                }

                var formData = new FormData()
                formData.append('upfile', input.files[0]);
                // 替换你的URL
                $.ajax(imageActionUrl, {
                    data: formData,
                    processData: false,
                    contentType: false,
                    type: "post",
                    success: function (data) {
                        try {
                            var link,
                                json,
                                loader;
                            json = JSON.parse(data);
                            link = imageUrlPrefix + json.url; if (json.state == "SUCCESS" && json.url) {
                                loader = me.document.getElementById(loadingId);
                                domUtils.removeClasses(loader, "loadingclass");
                                loader.setAttribute("src", link);
                                loader.setAttribute("_src", link);
                                loader.setAttribute("alt", json.original || "");
                                loader.removeAttribute("id");
                                me.fireEvent("contentchange");
                            } else {
                                showErrorLoader && showErrorLoader(json.state);
                            }
                        } catch (er) {
                            showErrorLoader &&
                                showErrorLoader(me.getLang("simpleupload.loadError"));
                        }
                    }
                });
                function showErrorLoader(title) {
                    if (loadingId) {
                        var loader = me.document.getElementById(loadingId);
                        loader && domUtils.remove(loader);
                        me.fireEvent('showmessage', {
                            'id': loadingId,
                            'content': title,
                            'type': 'error',
                            'timeout': 4000
                        });
                    }
                }
            }

需要注意的是，本文中的以上代码已经过修改及修复，无需像原文中那样单独指定服务器路径（前提是保证后端配置的ueditor.json文件是正确的）

更多详细请看原文，感谢原作者的解决方案。