How do I detect if ActiveX is enabled in the browser of client?

问题

How do I detect if ActiveX is enabled in the browser of client?

I tried following code, but it's not working in Firefox.

window.ActiveXObject not working in Firefox

any ideas?

check the example here: http://jsfiddle.net/qXSvQ/2/

I get false when I run this example.

回答1:

ActiveX objects do not exist in anything but Internet Explorer. If you're trying to use them for XMLHTTPRequests, use the XMLHTTPRequest() object instead, using feature detection.

if ("ActiveXObject" in window) { /* Do ActiveX Stuff */ }
else { /* ActiveX doesnt exist, use something else */ }

回答2:

What isn't working? Is that throwing an error in FF? How about

var hasAX = "ActiveXObject" in window;

回答3:

Below code should work, It is working on IE6 & FF 3.6.12 atleast.

if(typeof(window.ActiveXObject)=="undefined"){
    alert("ActiveX Object not supported");
}else {
    alert("ActiveX Object  supported");
}

来源：https://stackoverflow.com/questions/4313438/how-do-i-detect-if-activex-is-enabled-in-the-browser-of-client