blocks|key|1261695|text|var+full+=+window.location.host
//window.location.host+is+subdomain.domain.com
var+parts+=+full.split('.')
var+sub+=+parts[0]
var+domain+=+parts[1]
var+type+=+parts[2]
//sub+is+'subdomain',+'domain',+type+is+'com'
var+newUrl+=+'http://'+%2B+domain+%2B+'.'+%2B+type+%2B+'/your/other/path/'+%2B+subDomain
window.open(newUrl);|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1261696|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>var full = window.location.host
//window.location.host is subdomain.domain.com
var parts = full.split('.')
var sub = parts[0]
var domain = parts[1]
var type = parts[2]
//sub is 'subdomain', 'domain', type is 'com'
var newUrl = 'http://' + domain + '.' + type + '/your/other/path/' + subDomain
window.open(newUrl);
</code></pre>

blocks|key|1476311|text|除了@jlbang提到的情况之外，这在大多数情况下都可以工作|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1476312|const+split=location.host.split(".");
let+subdomain="";
let+domain="";
if(split.length==1){//localHost
++domain=split[0];
}else+if(split.length==2){//sub.localHost+or+example.com
++if(split[1].includes("localhost")){//sub.localHost
++++domain=split[1];
++++subdomain=split[0];
++}else{//example.com
++++domain=split.join(".");
++}
}else{//sub2.sub.localHost+or+sub2.sub.example.com+or+sub.example.com+or+example.com.ec+sub.example.com.ec+or++...+etc
++const+last=split[split.length-1];
++const+lastLast=split[split.length-2];
++if(last.includes("localhost")){//sub2.sub.localHost
++++domain=last;
++++subdomain=split.slice(0,split.length-1).join(".");
++}else+if(last.length==2+&&+lastLast.length<=3){//example.com.ec+or+sub.example.com.ec
++++domain=split.slice(split.length-3,split.length).join(".");
++++if(split.length>3){//sub.example.com.ec
++++++subdomain=split.slice(0,split.length-3).join(".");
++++}
++}else{//sub2.sub.example.com
++++domain=split.slice(split.length-2,split.length).join(".");
++++subdomain=split.slice(0,split.length-2).join(".");
++}
}
const+newUrl+=+'http://example.com/some/path/here/'+%2B+subdomain|code-block|syntax|javascript|1476313|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This could work in most cases except for the one that @jlbang mention 



<pre class="lang-js prettyprint-override"><code>const split=location.host.split(".");
let subdomain="";
let domain="";
if(split.length==1){//localHost
 domain=split[0];
}else if(split.length==2){//sub.localHost or example.com
 if(split[1].includes("localhost")){//sub.localHost
 domain=split[1];
 subdomain=split[0];
 }else{//example.com
 domain=split.join(".");
 }
}else{//sub2.sub.localHost or sub2.sub.example.com or sub.example.com or example.com.ec sub.example.com.ec or ... etc
 const last=split[split.length-1];
 const lastLast=split[split.length-2];
 if(last.includes("localhost")){//sub2.sub.localHost
 domain=last;
 subdomain=split.slice(0,split.length-1).join(".");
 }else if(last.length==2 &amp;&amp; lastLast.length&lt;=3){//example.com.ec or sub.example.com.ec
 domain=split.slice(split.length-3,split.length).join(".");
 if(split.length&gt;3){//sub.example.com.ec
 subdomain=split.slice(0,split.length-3).join(".");
 }
 }else{//sub2.sub.example.com
 domain=split.slice(split.length-2,split.length).join(".");
 subdomain=split.slice(0,split.length-2).join(".");
 }
}
const newUrl = 'http://example.com/some/path/here/' + subdomain
</code></pre>

blocks|key|1476355|text|我将Vlad的解决方案改编为现代打字版本：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1476356|const+splitHostname+=+(
++++hostname:+string
++):+{+domain:+string;+type:+string;+subdomain:+string+}+%7C+undefined+=>+{
++++var+urlParts+=+/([a-z-0-9]{2,63}).([a-z.]{2,5})$/.exec(hostname);
++++if+(!urlParts)+return;
++++const+[,+domain,+type]+=+urlParts;
++++const+subdomain+=+hostname.replace(`${domain}.${type}`,+"").slice(0,+-1);
++++return+{
++++++domain,
++++++type,
++++++subdomain,
++++};
++};|code-block|syntax|javascript|1476357|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I adapted Vlad's solution in modern Typescript:
<pre><code>const splitHostname = (
 hostname: string
 ): { domain: string; type: string; subdomain: string } | undefined =&gt; {
 var urlParts = /([a-z-0-9]{2,63}).([a-z.]{2,5})$/.exec(hostname);
 if (!urlParts) return;
 const [, domain, type] = urlParts;
 const subdomain = hostname.replace(`${domain}.${type}`, &quot;&quot;).slice(0, -1);
 return {
 domain,
 type,
 subdomain,
 };
 };
</code></pre>

blocks|key|1476395|text|从URL获取子域|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1476396|function+getSubdomain(url)+{
url+=+url.replace(+"https://www.","");
url+=+url.replace(+"http://www.","");
url+=+url.replace(+"https://","");
url+=+url.replace("http://",+"");
var+temp+=+url.split("/");
if+(temp.length+>+0)+{
++++var+temp2+=+temp[0].split(".");
++++if+(temp2.length+>+2)+{
++++++++return+temp2[0];
++++}
++++else+{
++++++++return+"";
++++}
}
return+"";|code-block|syntax|javascript|1476397|}|1476398|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

get a subdomain from URL
<pre><code>function getSubdomain(url) {
url = url.replace( &quot;https://www.&quot;,&quot;&quot;);
url = url.replace( &quot;http://www.&quot;,&quot;&quot;);
url = url.replace( &quot;https://&quot;,&quot;&quot;);
url = url.replace(&quot;http://&quot;, &quot;&quot;);
var temp = url.split(&quot;/&quot;);
if (temp.length &gt; 0) {
 var temp2 = temp[0].split(&quot;.&quot;);
 if (temp2.length &gt; 2) {
 return temp2[0];
 }
 else {
 return &quot;&quot;;
 }
}
return &quot;&quot;;
</code></pre>
}

I am having the URL <a href="http://somesubdomain.domain.com" rel="noreferrer">http://somesubdomain.domain.com</a> (subdomains may vary, domain is always the same). Need to take subdomain and reload the page with something like domain.com/some/path/here/somesubdomain using greasemonkey (or open a new window with URL domain.com/some/path/here/somesubdomain, whatever).

Get subdomain and load it to url with greasemonkey

我有网址 (子域可能会有所不同，域总是相同的)。需要获取子域并使用greasemonkey重新加载页面，比如domain.com/some/path/here/somesubdomain (或者打开一个新窗口，URL是domain.com/some/path/here/somesubdomain，随便什么)。

问获取子域并使用greasemonkey将其加载到url
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