Create a global javascript or jQuery variable visible in many pages -

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i have js variable many functions, , want create in 1 of them global variable visible in php file load js file.

how can ?

thanks help.

thaks : here's edit :

the variable has dynamic value , generated on event.keycode have tried in js file: window.selected_sku = null; in top of js file

and in appropriate function :

window.selected_sku =  v;

in php within javascript code, have : 

    if(window.selected_sku!=null){         alert(window.selected_sku);     }

but don't alert !!

help..

assign window 

window.variable = "this variable".

when include js file can access variable in file.


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