检查引荐来源网址

发布于 2024-08-16 23:05:43 字数 245 浏览 5 评论 0原文

我用它来检查某人是否来自 Reddit，但它不起作用。

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。

原文

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');
}

Suggestions on the regular expression are most welcome too.

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装迷糊 2024-08-23 23:05:43

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

Try this:

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

The regexp:

/^           # 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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长发绾君心 2024-08-23 23:05:43

关闭您的 if 父项...

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眼睛会笑 2024-08-23 23:05:43

我一直在使用正则表达式的替代方法，在引荐来源网址中查找域编辑

if (document.referrer.indexOf('reddit.com') >= 0) { alert('They came from Reddit.com'); }

：正如 thekingoftruth 指出的那样，如果 reddit.com 包含在 URL 参数中，则该方法不起作用，因此我对其进行了一些扩展。我还添加了 toLowerCase()，因为我在上面的正则表达式中发现了这一点。

if (document.referrer.indexOf('?') > 0){
    if (document.referrer.substring(0,document.referrer.indexOf('?')).toLowerCase().indexOf('reddit.com') >= 0){
    alert('They came from Reddit');
    }
} else {
    if (document.referrer.toLowerCase().indexOf('reddit.com') > 0){
            alert('They came from Reddit');
    }
}

I've been using an alternative to RegEx by looking for the domain in the referrer

if (document.referrer.indexOf('reddit.com') >= 0) { alert('They came from Reddit.com'); }

EDIT: As thekingoftruth points out that doesn't work if reddit.com is included in an URL parameter so I've extended it a little. I've also added toLowerCase() as I spotted that in the RegExp above.

if (document.referrer.indexOf('?') > 0){
    if (document.referrer.substring(0,document.referrer.indexOf('?')).toLowerCase().indexOf('reddit.com') >= 0){
    alert('They came from Reddit');
    }
} else {
    if (document.referrer.toLowerCase().indexOf('reddit.com') > 0){
            alert('They came from Reddit');
    }
}

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捶死心动 2024-08-23 23:05:43

试试这个：

ref.match(new RegExp("^http://(www\\.)?reddit\\.com/", "i"))

或者：

ref.match(/^http:\/\/(www\.)?reddit\.com\//i)

Try this:

ref.match(new RegExp("^http://(www\\.)?reddit\\.com/", "i"))

Or:

ref.match(/^http:\/\/(www\.)?reddit\.com\//i)

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聽兲甴掵 2024-08-23 23:05:43

我会用这个，这不是一个更简单的方法吗？

  var referral= document.refferer;
   If(referral.includes("www.reddit.com"){
  alert("you came from reddit");
   }
     else{
    alert("you didn't come from reddit");
       {

I would use this, wouldn't it be a lesser and simply way?

  var referral= document.refferer;
   If(referral.includes("www.reddit.com"){
  alert("you came from reddit");
   }
     else{
    alert("you didn't come from reddit");
       {

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