服务器准备IIS
需要设置IIS里面的HTTP响应标头，如图添加如下设置，添加这项“Access-Control-Allow-Origin”，只有添加了这行才能支持跨域，不然像Chrome浏览器会报错
页面代码：
XML/HTML Code复制内容到剪贴板 <!DOCTYPE html> <html> <head> <meta http-equiv="content-type" content="text/html;charset=utf-8"> <meta name="format-detection" content="telephone=no"> <meta name="msapplication-tap-highlight" content="no"> <meta name="viewport" content="user-scalable=no, initial-scale=1, maximum-scale=1, minimum-scale=1, width=device-width"> <title>Html5上传文件</title> </head> <body> <div class="app"> <h1>Html5上传文件测试，带进度条</h1> <div> <input type="file" value="" id="fileInput" name="files" onchange="fileSelected()" /> <div style="margin:30px;"> <input type="button" value="上传" onclick="uploadFile()" /> </div> <div style="margin:30px;"> <div id="fileName"></div> <div id="fileSize"></div> <div id="fileType"></div> </div> <div style="margin:30px;width:500px;height:15px;border:1px solid #aeaeae;"> <div id="progress" style="background:#4cff00;height:15px;width:0%;"></div> <div id="percentNumber"></div> </div> <div style="margin:30px;"> <div id="msg"></div> </div> </div> </div> <script type="text/javascript"> function fileSelected() { //重置状态显示 document.getElementById("msg").innerHTML = ""; document.getElementById(percentNumber).innerHTML = ; document.getElementById("progress").style.width = "0%"; var file = document.getElementById(fileInput).files[0]; if (file) { var fileSize = 0; if (file.size > 1024 * 1024) fileSize = (Math.round(file.size * 100 / (1024 * 1024)) / 100).toString() + MB; else fileSize = (Math.round(file.size * 100 / 1024) / 100).toString() + KB; document.getElementById(fileName).innerHTML = Name: + file.name; document.getElementById(fileSize).innerHTML = Size: + fileSize; document.getElementById(fileType).innerHTML = Type: + file.type; } } function uploadFile() { var fd = new FormData(); fd.append("fileInput", document.getElementById(fileInput).files[0]); var xhr = new XMLHttpRequest(); xhr.upload.addEventListener("progress", uploadProgress, false); xhr.addEventListener("load", uploadComplete, false); xhr.addEventListener("error", uploadFailed, false); xhr.addEventListener("abort", uploadCanceled, false); xhr.open("POST", "http://10.0.0.200:9001/Home/Upload");//修改为自己服务器接口地址 //xhr.setRequestHeader("Access-Control-Allow-Origin", "*");//需要在IIS里面配置，就可以跨域请求了 //xhr.setRequestHeader("Content-Type", "multipart/form-data"); xhr.send(fd); } function uploadProgress(evt) { if (evt.lengthComputable) { var percentComplete = Math.round(evt.loaded * 100 / evt.total); document.getElementById(percentNumber).innerHTML = percentComplete + %; var jindutiao = document.getElementById("progress"); jindutiao.style.width = percentComplete + "%"; } else { document.getElementById(percentNumber).innerHTML = 不支持进度计算; } } function uploadComplete(evt) { //evt.target.responseText document.getElementById("msg").innerHTML = "上传成功"; } function uploadFailed(evt) { document.getElementById("msg").innerHTML = "上传过程中有一个错误"; } function uploadCanceled(evt) { document.getElementById("msg").innerHTML = "用户取消了上传或者浏览器删除了连接"; } </script> </body> </html>以上这篇使用Html5实现异步上传文件,支持跨域,带有上传进度条就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持脚本之家。
