如何检查浏览器是否支持 HTML5 文件上传(FormData 对象)? [英] How can I check if the browser support HTML5 file upload (FormData object)?

问题描述

如何查看浏览器是否支持 HTML5 文件上传(FormData 对象)?

How can I check if the browser support HTML5 file upload (FormData object)?

var fd = new FormData();

遵循此帖子的答案，但代码确实不返回有关浏览器的正确答案，

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

但正确的浏览器支持应该是，

But the correct browser support should be,

Firefox - supported
Chrome - supported
Opera - not supported
Safari - supported
IE9 - not supported

我已经在 Opera 上测试了 html 5 文件上传，它肯定不能工作.

I have tested the html 5 file upload on Opera and it is not working for sure.

我确定 safari 支持 html 5 文件上传.

I am sure that safari supports html 5 file upload.

推荐答案

尝试 if( window.FormData === undefined ) 或 if( window.FormData !== undefined ).

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