How Can I Execute Multiple Javascript Functions Asynchronous?

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Javascript

jQuery

I have two functions as below example.

function CallAsysnc(){

FirstFun(); // 1st function
SecondFun(); //2nd function
}

if i run this code then as we know javascript run in a single thread but i need asynchronous call.
even how can i call js files parallel? or how could it be done using async.js?

will appreciate your response.
Many Thanks!

Regards
Gaurv