通过ajax下载zip文件（包含xml和图像）并将二进制数据存储在IE的localstorage中

Question

我能够通过ajax调用从服务器下载zip文件（2mb）并将二进制数据存储在Web存储中，因为这是不在IE中工作（7,8,9）。以下是我的代码。

var req = new XMLHttpRequest(); 
    req.open('GET', filename, false); 
    req.onreadystatechange=function() 
    { 
     if (req.readyState == 4) 
     { 
     if(req.status!=200){ 
      chk_file = false; 
      alert('Sorry, Error occured while downloading the question paper. HTTP Error Code: '+req.status); 
     } 
     } 
    } 
    if (req.overrideMimeType) { 
     req.overrideMimeType('text/plain; charset=x-user-defined'); 
    } else { 
     req.setRequestHeader('Accept-Charset', 'x-user-defined'); 
    } 
    req.send('hello'); 

    var buffer = ""; 
    var dbata; 
    try { 
     bdata = BinaryToArray(req.responseBody).toArray(); 
     for (var i = 0, len = bdata.length - 1; i < len; i++) {// dbata is one byte too long. Why ??? 
      buffer += String.fromCharCode(bdata[i] & 0xFF); 
     } 
    } catch(e) { 
     bdata = req.responseText; 
     for (var i = 0, len = bdata.length; i < len; i++) { 
      buffer += String.fromCharCode(bdata.charCodeAt(i) & 0xFF); 
     } 
    } 

将二进制数据转换为VB脚本中的数组。以下是代码。

var IE_HACK = (/msie/i.test(navigator.userAgent) && 
        !/opera/i.test(navigator.userAgent)); 

    if (IE_HACK) { 
     var vbScript = '<scr' + 'ipt type="text/vbscript">\n'+ 
      '<!-' + '-\n' + 
      'Function BinaryToArray(Binary)\n'+ 
      ' Dim i\n'+ 
      ' ReDim byteArray(LenB(Binary))\n'+ 
      ' For i = 1 To LenB(Binary)\n'+ 
      ' byteArray(i-1) = AscB(MidB(Binary, i, 1))\n'+ 
      ' Next\n'+ 
      ' BinaryToArray = byteArray\n'+ 
      'End Function\n'+ 
      '--' + '>\n' + 
      '</scr' + 'ipt>'; 

     //$(vbScript).insertAfter("script:last"); 
     document.write(vbScript); 

将此缓冲区值存储在html5网络存储中。

我没有在IE浏览器中使用FF，Chrome浏览器获取完整内容。

任何帮助！

Answer 1

也许这可以帮助你，但你猜你现在解决了这一点，但它可能会帮助那些看到这个问题的人

is there a cross-browser alternative to the xhr.overrideMimeType() function?

https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/Sending_and_Receiving_Binary_Data

https://github.com/eligrey/FileSaver.js

http://stuk.github.io/jszip/