Use javascript to obtain URL parameters

Server-side languages such as PHP, ASP, and JSP provide functions for obtaining URL parameters,

However, when page caching is required, the functions of the server are limited.

Therefore, using javascript to obtain URL parameters is a feasible solution in these cases.

The simplest implementation is as follows:

Function
GetUrlParam
(Name
)
{
Name
=
Name
. Replace
(/[[]
/,"\[
"). Replace
(/[]
/, "\]
");
Var
RegexS
=
"[\? &]
"+
Name
+
"= ([^ & #] *)
";
Var
Regex
=
New
RegExp
(RegexS
);
Var
Results
=
Regex
. Exec
(Window
. Location
. Href
);
If
(Results
=
=
Null
)
Return
"";
Else

Return
Results
[1
];
}

Execute the following statement in javascript:
Var channel = getUrlParam (channel );

The channel value is sem.