What I have in mind is this... We are going to have people come from a particular site during a acquisition campaign and was wondering how I could conditionalize a certain section of my site to display a thank you message instead of the sign up form as they would have had the opportunity to fill this out before coming to my landing page.What I have in mind is this... We are going to
阅读背景：
我该如何写一个条件语句来检查访问者是否来自某个网站?
来源：互联网
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