JS gets the current domain name, URL, relative path and parameters, and specified parameters

1. JS get the current domain name there are two ways

Method one: var domain =document.domain;

Method two: var domain =window.location.host;

Note the problem:

Since the current domain name obtained does not include http://, so when assigning the acquired domain name to the A-tag href, do not forget to add http://, otherwise the navigation error when clicking the link.

1. 4 ways to get the current URL
2. method to get the current URL parameter

Mode one: varURL =window.location.href;

Mode two: varURL =self.location.href;

Mode three: varURL = document. URL;

Mode four: varURL =document.location;

Note the question: What is displayed in the IE Address bar and what URL is obtained.

3. Ways to get relative paths

First get the URL, then the URL through//cut into two parts, and then intercept the relative path from the latter part. If there are parameters in the intercepted relative path, the parameters are removed.

Functiongeturlrelativepath ()

{

varURL =document.location.tostring ();

Vararrurl = Url.split ("//");

var start = Arrurl[1].indexof ("/");

Varrelurl = arrurl[1].substring (start),//stop omitted, intercepts all characters from start to end

if (Relurl.indexof ("?")! =-1) {

Relurl= relurl.split ("?") [0];

}

Returnrelurl;

}

Calling method: Geturlrelativepath ();

Example: If the current Url is http//www. Liangshunet. COM/PUB/ITEM.ASPX?T=OSW7, the relative path that is intercepted is:/pub/item.aspx.

Functiongeturlpara ()

{

varURL =document.location.tostring ();

Vararrurl = Url.split ("?");

Varpara = arrurl[1];

Returnpara;

}

Calling method: Geturlpara ()

Example: If the current Url is http//www. Liangshunet. COM/PUB/ITEM.ASPX?T=OSW7, the part of the parameter that is intercepted is: T=OSW7.

1. Gets the method that specifies the URL parameter

Paraname wait for the name of the parameter

Functiongeturlparam (paraname) {

varURL =document.location.tostring ();

Vararrobj = Url.split ("?");

if (arrobj.length> 1) {

Vararrpara = Arrobj[1].split ("&");

Vararr;

for (var i = 0; I <arrPara.length; i++) {

Arr= arrpara[i].split ("=");

if (arr! = Null&&arr[0] ==paraname) {

RETURNARR[1];

}

}

Return "";

}

else {

Return "";

}

}

Calling Method: Geturlparam ("id");

To illustrate:

If the URL of the webpage has such a parameter test.htm?id=896&s=q&p=5, then call Geturlparam ("P"), return 5.

JS gets the current domain name, URL, relative path and parameters, and specified parameters