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怎么利用网页，判断用户机器上有没有安装这个软件

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Release： 2016-06-13 10:03:16
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如何利用网页，判断用户机器上有没有安装这个软件
我们为网站开发了一个小软件，有自己发信息聊天的功能，包括读取网站信息等。
现在想请问一下，如何利用网页，判断用户机器上有没有安装这个软件？如果安装了，可以启动这个软件的发信息窗口，如果没有，到下载安装页面。

类似QQ那样？模仿QQ在线/离线 



------解决方案--------------------
曾经我也问过这种问题。

有人告诉我说这是违法的。。-_-!!!

后来我问经理。因为我们当时正在做这种东西。

经理告诉我这是安装那个软件的时候由软件方提供插件

ActiveX插件。

然后网页里可以用JS代码判断有没有安装这个插件。

这样就可以判断你的电脑里有没有安装这个你要的软件了。。嗯。。
------解决方案--------------------
php是不能.

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