没有jquery或iframe的AJAX文件上传/表单提交？

如果我理解正确，则可以使用以下代码异步上传文件。随意修改

var AjaxFileUploader = function () {    this._file = null;    var self = this;    this.uploadFile = function (uploadUrl, file) {        var xhr = new XMLHttpRequest();        xhr.onprogress = function (e) { ...        };        xhr.onload = function (e) { ...        };        xhr.onerror = function (e) { ...        };        xhr.open("post", uploadUrl, true);        xhr.setRequestHeader("Content-Type", "multipart/form-data");        xhr.setRequestHeader("X-File-Name", file.name);        xhr.setRequestHeader("X-File-Size", file.size);        xhr.setRequestHeader("X-File-Type", file.type);        xhr.send(file);    };};AjaxFileUploader.IsAsyncFileUploadSupported = function () {    return typeof (new XMLHttpRequest().upload) !== 'undefined';} if (AjaxFileUploader.IsAsyncFileUploadSupported) {        ajaxFileUploader = new AjaxFileUploader();        $("form").submit(function () { var uploader = $("#fileUploader")[0]; if (uploader.files.length == 0) {     return; } else {     ajaxFileUploader.uploadFile(         "/YourUploadUrl",         uploader.files[0]); } return false;        });    }

要上传表单，请使用FormData类，使用表单值填充该表单，然后使用XHR进行发布。

更新： 对于HTML4，请尝试以下操作

• http://www.albanx.com/?pid=5&subid=21