javascript - What is the difference between x++ and ++x -

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possible duplicate:
incrementing in c++ - when use x++ or ++x?

what difference between x++ , ++x ?

x++ executes statement , increments value.

++x increments value , executes statement.

var x = 1; var y = x++; // y = 1, x = 2 var z = ++x; // z = 3, x = 3

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