How to stop execution of statements in a function after window.open()

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Javascript

I have method with different function which has 10 lines of code....
in 5th line I've window.open() statement...
Rest of the lines from 6th line should execute only on close of the above window.
How do we do in java script

What I have tried:

var url= "http://www.google.com"
var win = window.open(url,"","");
--retrun value = Yes
if(win.retrunVal){
.....
}