我如何检查浏览器是否支持HTML5文件上传（FormData对象）？

问题描述

$ b

  / code>。
 
How can I check if the browser support HTML5 file upload (FormData object)?
var fd = new FormData();
Following the answer from this post, but the code does not return correct answer about the browser,
window.onload = function()
{
 if (!!window.FileReader)
 {
  alert('supported');
 }
 else
 {
  alert('not supported');
 }
}


Firefox - supported
Chrome - supported
Opera - supported
Safari - not supported
IE9 - not supported
But the correct browser support should be,
Firefox - supported
Chrome - supported
Opera - not supported
Safari - supported
IE9 - not supported
I have tested the html 5 file upload on Opera and it is not working for sure. 
I am sure that safari  supports html 5 file upload.
 解决方案 
Try if( window.FormData === undefined ) or if( window.FormData !== undefined ).
                        
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