检查推荐人 [英] Checking the referrer

问题描述

我正在用它来检查是否有人来自Reddit，但它不起作用。

I'm using this to check if someone came from Reddit, however it doesn't work.

var ref = document.referrer;
if(ref.match("/http://(www.)?reddit.com(/)?(.*)?/gi"){
    alert('You came from Reddit');
} else {
    alert('No you didn\'t');
}

关于正则表达式的建议也非常受欢迎。

Suggestions on the regular expression are most welcome too.

推荐答案

试试这个：

if (ref.match(/^https?:\/\/([^\/]+\.)?reddit\.com(\/|$)/i)) {
  alert("Came from reddit");
}

正则表达式：

/^           # ensure start of string
 http        # match 'http'
 s?          # 's' if it exists is okay
 :\/\/       # match '://'
 ([^\/]+\.)? # match any non '/' chars followed by a '.' (if they exist)
 reddit\.com # match 'reddit.com'
 (\/|$)      # match '/' or the end of the string
/i           # match case-insenitive

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