如何从计算机重定向?(不是从手机上)

我在主页(pc)上使用此代码将用户重定向到我的网站的移动页面?如果用户不是来自移动设备，可以在移动页面上使用相同的代码将用户重定向到主页吗?

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这个代码重定向到移动页面，如果他们是从移动..我想把这个代码在移动页面和重定向用户到主站点，如果他们不是从移动!