如何在页面中判断ActiveX插件是否已安装

查看 msdn->dhtml references关于object element的说明，很详细
Inserts an object into the HTML page.

Remarks

An object can appear in the head or the body of a document.

If an object fails to instantiate for any reason, the HTML inside the OBJECT element is rendered. This provides a convenient way to inform the user that the object failed to load. The following code fragment illustrates this technique.



Possible return values (those generated by Dynamic HTML (DHTML) Object Model properties) on the OBJECT element depend on the implementation of the object. For example, the readyState property returns null or error if the object does not implement a readyState property. DHTML Object Model properties available for an object depend on the content of the object. For information about supported properties, see the documentation for the individual object.

Events are sent directly to the OBJECT element. If the event is returned by the embedded object, it bubbles accordingly. If the event is not returned, it does not bubble.

OBJECT event handlers also can be defined in script (see Example).

Note You can use the object property for the object element to reconcile DHTML Object Model members that are duplicated by the object element's implementation and by DHTML. For instance, if the object implements an item method and DHTML implements an item method, use document.all.objectID.object.item() to access the one defined for the object.
The OBJECT element is a block element and requires a closing tag.

This element is available in HTML as of Microsoft® Internet Explorer 3.0, and in script as of Internet Explorer 4.0.

This element is an inline element.

This element requires a closing tag.

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