function - Most efficient / Best way to call a javascript method contained within an object - by string -

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alright - here's story:

i have form definition: 

<form method="post" data-callback="object[callback]">

there global living object called: object has method callback();

what best method of parsing string in "data-callback", converting function name (but can object - - not global function) , calling specific params, applied specific context? :)

thanks!


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