javascript - Window.onload Scope -

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let's have following code:

var x; window.onload = function(){    x=4; }; console.log(x);

the console doesn't output 4, undefined.

does know how able access changed x variable outside of window.onload function?

thanks in advance!

this has javascript's async behavior. console.log doesn't happen after window.onload has fired. they're separate events. if want output x, need 

var x; window.onload = function(){    x=4;    console.log(x); };

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