基于域名的JavaScript重定向

Question

I am not looking for a simple redirect.

What I am trying to do is this.

Person A loads site BOB.com and clicks a link to page X.
Person B loads site TIM.com and clicks a link to the same page X.

Page X has a javascript command on it that says, If user came from site Bob.com then redirect to Bob.com/hello.
If user came from TIM.com then redirect to Tim.com/hello.
If user didnt come from ether then redirect to Frank.com/opps.

This page X is going to handle 404 errors for multiple domains so it will need to ONLY look at the domain name upto ".com". It should ignore everything past the ".com".

This is the script I started with.

<script type='text/javascript'>
var d = new String(window.location.host);
var p = new String(window.location.pathname);
var u = "http://" + d + p;
if ((u.indexOf("bob.com") == -1) && (u.indexOf("tim.com") == -1))
{
u = u.replace(location.host,"bob.com/hello");
window.location = u;
}
</script> 

Answer 1

Use document.referrer

if(/http:\/\/(www\.)?bob\.com/.test(document.referrer)) {
   window.location = "http://bob.com/hello";
}

else if(/http:\/\/(www\.)?tim\.com/.test(document.referrer)) {
   window.location = "http://tim.com/hello";
}

else {
   window.location = "http://frank.com/oops";
}

Instead of the regex, you can use indexOf like you did initially, but that would also match thisisthewrongbob.com and thisisthewrongtim.com ; the regex is more robust.

Answer 2

document.referrer是要去的地方

Answer 3

Use document.referrer to find where the user came from.

The updated code is

<script type='text/javascript'>
  var ref = document.referrer,
      host = ref.split('/')[2],
      regexp = /(www\.)?(bob|tim).com$/,
      match = host.match(regexp);

  if(ref && !regexp.test(location.host)) { 
  /* Redirect only if the user landed on this page clicking on a link and 
    if the user is not visiting from bob.com/tim.com */
    if (match) {
      ref = ref.replace("http://" + match.shift() +"/hello");
    } else {
      ref = 'http://frank.com/oops';
    }

    window.location = ref;
  }
</script>

working example (it displays a message rather than redirecting)