about "var yahoo = window.yahoo || {}"

[zhonghua]

Hi,

Who can tell me the means of "var perf = window.perf || {}" ;

Thanks

 

[Vincent van Beveren]

Who can tell me the means of "var perf = window.perf || {}" ;

variable pref is set to window.perf if not null, else to an empty
key,value array.

Greetings,
Vincent

 

[zhonghua]

ok

Thank you very much .

variable pref is set to window.perf if not null, else to an empty
key,value array.

Greetings,
Vincent