Ensure that only the cooike version can be opened once on the page

Recently, webim is embedded in the OA system. Because webim is on an independent page, multiple pages will appear if you click it multiple times. In this way, the server push will not recognize the page under ie6. so with the followingCode:

    <  Script Language  =  "  Javascript  "  Type  =  "  Text/JavaScript  "  > 
Window. onload = function (){
If (getcookie ("isopen") = ""){
Setcookie ("isopen", "1 ");
Startservice ();
} Else {
Window. onUnload = NULL;
Window. Opener = NULL;
Window. Open ("", "_ Self ");
Window. Close ();
}
}
 
Window. onUnload = function (){
If (getcookie ("isopen ")! = "")
Deletecookie ("isopen ");
}
 
 

 
   Function Getcookieval (offset ){
  //  /<Summary>  
    //  /// Obtain the cookie value whose name is offset  
    //  /</Summary>  
    //  /<Param name = "name"> cookie name </param>  
   VaR  Endstr  =  Document. Cookie. indexof (  "  ;  "  , Offset );
  If  (Endstr  =     -  1  )
Endstr  = Document. Cookie. length;
  Return  Unescape (document. Cookie. substring (offset, endstr ));
}

  Function  Getcookie (name ){
  //  /<Summary>  
    //  /Obtain the cookie value by name  
    //  /</Summary> 
    //  /<Param name = "name"> cookie name </param>  
    VaR  ARG  =  Name  +     "  =  "  ;
  VaR Alen  =  Arg. length;
  VaR  Clen  =  Document. Cookie. length;
  VaR  I  =     0  ;
  While  (I  <  Clen ){
 VaR  J  =  I  +  Alen;
  If  (Document. Cookie. substring (I, j)  =  Arg)
  Return  Getcookieval (j );
I  =  Document. Cookie. indexof (  "    "  , I)  +     1  ;
  If  (I  =     0  )  Break  ;
}
  Return     ""  ;
}


 Function  Setcookie (name, value ){
  //  /<Summary>  
    //  /Set cookie  
    //  /</Summary>  
    //  /<Param name = "name"> cookie name </param> 
    //  /<Param name = "value"> cookie value </param>  
    VaR  Argc  =  Setcookie. Arguments. length;
  VaR  Argv  =  Setcookie. arguments;
  VaR  Path =  (Argc  >     3  )  ?  Argv [  3  ]:  Null  ;
  VaR  Domain  =  (Argc  >    4  )  ?  Argv [  4  ]:  Null  ;
  VaR  Secure  =  (Argc  >     5  )  ?  Argv [ 5  ]:  False  ;


Document. Cookie  =  Name  +     "  =  "     +  Value  +  
(Path  =    Null  )  ?     ""  :(  "  ; Path =  "     +  Path ))  +  
(Domain  =     Null )  ?     ""  :(  "  ; Domain =  "     +  Domain ))  +  
(Secure  =     True  )  ?    "  ; Secure  "  :  ""  );
}

  Function  Deletecookie (name ){
  //  /<Summary>  
    //  /Delete cookie  
   //  /</Summary>  
    //  /<Param name = "name"> cookie name </param>  
    VaR  Exp  =     New  Date ();
Exp. settime (exp. gettime ()  -    1  );
  VaR  Cval  =  Getcookie (name );
Document. Cookie  =  Name  +     "  =  "     +  Cval  +    "  ; Expires =  "     +  Exp. togmtstring ();
}
  <  /  SCRIPT> 

Put the above Code under the head. Is it easy enough? Of course, the above Code mainly solves the problem of opening a page with a hyperlink. If it is a page opened by window. Open, it is simpler. The Code is as follows:

  var win  =    null  ; ///   define a variable for judgment.   
     If   (WIN  =    null  ) 
{< br> win  =  window. open (  "  main. aspx   " ,   '' , strfeatures ); 
}