Javascript retrieves parameter values from url strings

Javascript obtains parameter values from url strings. It is particularly important today when Ajax is prevalent, because ajax needs to pass values in most cases to achieve better user interaction, it is not difficult to use JS to obtain URL string parameters. For a simple example, see the following functions:

 

Function getQuery (name)

{

Var reg = new RegExp ("(^ | &)" + name + "= ([^ &] *) (& | $ )");

Var r = window. location. search. substr (1). match (reg );

If (r! = Null) return unescape (r [2]); return null;

}

 

The preceding JS function uses a regular expression to obtain URL string parameters? A = my & id = 2233 & m = OK to obtain the id value. In combination with the above functions, you can call getQuery ("id") on the current page.