Method 1: Use regular expressions to get address bar parameters: (highly recommended, practical and convenient! )
Function GetQueryString (name)
{
Var reg = new regexp ("(|&; ) "+name+"= ([&; ]*)(& amp； |$)");
var r = window . location . search . substr( 1)。 Matching (reg);
if(r！ =null) returns unescape (r [2]); Returns null
}
//Call the method
Alert(GetQueryString ("parameter name1"));
Alert(GetQueryString ("parameter name 2"));
Alert(GetQueryString ("parameter name 3"));
Here's an example:
If the address bar is: abc.html? id = 123 & amp； url=
Then, it is called by the above method: alert (get query string ("URL"));
A dialog box will pop up: the content is
If you use: alert (get query string ("ID")); Then the pop-up content is123;
Of course, if you don't pass parameters, such as the address is abc.html, and there are no parameters, then sometimes it will be wrong to forcibly output the call result:
Therefore, a judgment is added to judge whether the requested parameter is empty. First, assign values to variables:
var myurl = getquery string(" URL ")；
If (myurl! = null & amp& ampmyurl.toString()。 Length & gt 1)
{
alert(getquery string(" URL "))；
}
So you won't make mistakes!
Method 2: Traditional method
& ltscript type = " text/JavaScript " & gt；
Function UrlSearch ()
{
Var name, value;
Varstr = location.href// gets the entire address bar.
var num=str.indexOf("？ )
str = str . substr(num+ 1)； //Get all parameters stringvar.substr (start [,length]).
var arr = str . split(& amp； ); //Put each parameter into an array.
for(var I = 0； I < array length; i++){
num=arr[i]。 index of(" = ")；
if(num & gt； 0){
name=arr[i]。 Substring (0, num);
value=arr[i]。 substr(num+ 1)；
This [name] = value;
}
}
}
var Request = new UrlSearch()； //instantiation
alert(request . id)；
& lt/script & gt；
For example, save this code as 1.html.
So you want to visit 1.html? Id = test
At this point, the value of test is obtained.
Call in html
& ltscript type = " text/JavaScript " & gt；
var a =
& lt/script & gt；
& lt/head & gt；
& ltbody & gt
& lta id = " a 1 " href = " " & gt； sadfsdfas & lt/a & gt；
& lt script & gt
var a 1 = document . getelementbyid(" a 1 ")；
a 1 . href = a；
& lt/script & gt；
& ltscript type = " text/JavaScript " & gt；
var a="/gg.htm？ CCTV ";
var s=a.indexOf("？ );
var t = a . substring(s+ 1)； // t is it? There's something back there.
& lt/script & gt；
Stringvar.substr (start [,length]
Returns a substring of the specified length starting at the specified position.
String variable
Required option. String literal or string object to extract substring.
begin
Required option. The starting position of the required substring. The index of the first character in the string is 0.
length
Optional. The number of characters that should be included in the returned substring.
If the length is 0 or negative, an empty string will be returned. If this parameter is not specified, the substring will continue to the end of stringvar.
The following are some relevant parameters:
Str.toLowerCase () is converted to lowercase.
The string str.toUpperCase () is all converted to uppercase.
A URL is a uniform resource locator (URL).
A complete URL consists of the following parts:
scheme://host:port/path？ Query # fragment
Scheme: communication protocol
Commonly used /index.html? ver= 1.0。 Id = 6 # Here it is.
You can get all the parts in javascript.
1，window.location.href
The complete URl string (the complete address bar in the browser)
The return value of this example: /index.html? ver= 1.0。 Id = 6 # Here it is.
2. Window. Location. Protocol
Protocol part of URL
The return value of this example:
4、window.location.port
Port part of URL
If the default port 80 is adopted (update: even if 80 is added), the return value is not the default 80 but a null character.
The return value of this example: ""
5. Window. Location. Pathname
The path part of the URL (that is, the file address)
The return value of this example:/fisker/post/0703/window.location.html.
6. Window. Location. Search
Query (parameter) section
In addition to assigning values to dynamic languages, you can also assign values to static pages and use javascript to obtain corresponding parameter values.
The return value of this example:? ver= 1.0。 id=6
7, window.location
Anchor point
The return value of this example: #imhere