我想从我的Firefox扩展下载一些二进制数据。当我尝试设置创建XMLHtt prequest到arraybuffer方式：

I'm trying to download some binary data from my Firefox extension. When I try to set a created XMLHttpRequest to arraybuffer mode:

oHTTP = new XMLHttpRequest();   
oHTTP.responseType = "arraybuffer";

错误

InvalidStateErr
An attempt was made to use an object that is not, or is no longer, usable

被抛出。

有另一种方式来下载二进制数据的Firefox扩展？

Is there another way to download binary data in a Firefox extension?

推荐答案

您必须首先调用打开方法。