IE8 / 9中的FormData
我已经实现了这个脚本上传与AJAX文件，它在除了资源pipe理器以外的其他浏览器完美的工作，我注意到，formData不支持IE9和更less，是否有任何替代formData在IE中，我想用干净的JavaScript
function doObjUploadExplorer(url, lnk_id, file, progress, success, content, frm, div_dlg, start_func){ var file_input = null, frm_data = new FormData(), req; try { //firefox, chrome, safari etc req = new XMLHttpRequest(); } catch (e) { // Internet Explorer Browsers req = new ActiveXObject("Microsoft.XMLHTTP"); } if (document.getElementById(file)) { file_input = document.getElementById(file); for (var i = 0; i < file_input.files.length; ++i) { frm_data.append(file, file_input.files[i]); } } req.upload.addEventListener('progress', function(e) { //Event called while upload is in progress if (progress !== undefined && e.lengthComputable) { $('#' + progress).html('<font>Uploading... ' + Math.round((e.loaded / e.total) * 100) + '%</font>'); } }); req.upload.addEventListener('load', function(e) { //Event called when upload is completed $('#' + progress).html('<font>Retrieving updated data...</font>'); }); req.upload.addEventListener('error', function(e) { //Event called when an error is returned by the server alert('An error has occurred...'); }); req.addEventListener('readystatechange', function(e) { if (this.readyState === 4) { if (this.status === 200) { if (content !== undefined) { $('#' + content).html(this.response); } if (success !== undefined) { showChkMark(success); } } else { console.log('Server replied with HTTP status: ' + this.status); } if (progress !== undefined) { $('#' + progress).hide(); } if (div_dlg !== undefined) { $('#' + div_dlg).dialog('close'); } $('#' + file) .attr('disabled', false) .val(''); } }); if (progress !== undefined) { $('#' + progress).show(); } $('#' + file).attr('disabled', true); url += ( url.indexOf('?') === -1 ? '?' : '&' ); url += 'lnk_id=' + lnk_id + '&file=' + file; req.open('POST', url); req.setRequestHeader('Cache-Control', 'no-cache'); if (start_func !== undefined) { start_func.apply(); setTimeout(function() { req.send(frm_data); }, 500); } else { req.send(frm_data); }} IE中的FormData只支持IE10，经过一番研究，最好的解决办法就是使用ajaxForm： http ： //malsup.com/jquery/form/在IE8 / 9中完美无瑕，不知道IE7
