var Foo = (function() { var x = 0; function Foo() {} Foo.prototype.increment = function() { ++x; console.log(x); }; return Foo; })(); var a = new Foo(); a.increment(); a.increment(); var b = new Foo(); a.increment();
1, 2, 1
0, 1, 0
0, 1, 2
1, 2, 3
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