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js 上传文件进度条 [uboot使用]

 1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">                                                                     
 2 <html>
 3     <head>
 4         <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 5         <title>文件上传 原生ajax上传</title>
 6         <style type="text/css">
 7             .container{
 8                 width: 200px;
 9                 height: 20px;
10                 background-color: gray;
11             }
12             #progress{
13                 height: 20px;
14                 background-color: orange;
15                 display: inline-block;
16             }
17 
18         </style>
19     </head>
20     <body>
21         <form 
22             enctype="multipart/form-data" method="post">
23             上传文件1: <input type="file" name="firmware" id="firmware"><br />
24             <div class='container'>
25                 <span id="progress"></span>
26             </div>
27         </form>
28         <br>
29         <button onclick="fileSelected()">文件信息</button><button onclick="uploadFile()">确认上传</button>
30         <div id="info">
31             <div id="fileName"></div>
32             <div id="fileSize"></div>
33             <div id="fileType"></div>
34         </div>
35         <div id="result"></div>
36         <script src="https://cdn.staticfile.org/jquery/1.10.2/jquery.min.js"> </script>
37         <script type="text/javascript">
38             function fileSelected() {
39                 var file = document.getElementById('firmware').files[0];
40                 if (file) {
41                     var fileSize = 0;
42                     if (file.size > 1024 * 1024) {
43                         fileSize = (Math.round(file.size * 100 / (1024 * 1024)) / 100).toString() + 'MB';
44                     } else {
45                         fileSize = (Math.round(file.size * 100 / 1024) / 100).toString() + 'KB';
46                     }
47                     document.getElementById('fileName').innerHTML = 'Name: ' + file.name;
48                     document.getElementById('fileSize').innerHTML = 'Size: ' + fileSize;
49                     document.getElementById('fileType').innerHTML = 'Type: ' + file.type;
50                 }
51             }
52 
53 function uploadFile() {
54     var fd = new FormData();
55     fd.append("firmware", document.getElementById('firmware').files[0]);
56     var xhr = new XMLHttpRequest();
57     xhr.upload.addEventListener("progress", uploadProgress, false);
58     xhr.addEventListener("load", uploadComplete, false);
59     xhr.addEventListener("error", uploadFailed, false);
60     xhr.addEventListener("abort", uploadCanceled, false);
61     xhr.open("POST", "/");
62     xhr.send(fd);
63 }
64 
65 function uploadProgress(evt) {
66     if (evt.lengthComputable) {
67         var percent = Math.round(evt.loaded * 100 / evt.total);
68 
69         document.getElementById('progress').innerHTML = percent.toFixed(2) + '%';
70         document.getElementById('progress').style.width = percent.toFixed(2) + '%';
71     }
72     else {
73         document.getElementById('progress').innerHTML = 'unable to compute';
74     }
75 }
76 
77 function uploadComplete(evt) {
78     document.getElementById('result').innerHTML = evt.target.responseText;
79 }
80 
81 function uploadFailed(evt) {
82     alert("There was an error attempting to upload the file.");
83 }
84 
85 function uploadCanceled(evt) {
86     alert("The upload has been canceled by the user or the browser dropped the connection.");
87 }
88 
89 </script>
90 
91 </body>
92 </html>

可以直接转为uboot调用页面

jquery使用精简版: 别人改的...

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原文地址：https://www.cnblogs.com/listenerln/p/10267338.html