下面的代码输出什么?

      var foo = { bar: 1 };
      var arr1 = [1, 2, foo];
      var arr2 = arr1.slice(1);

      arr2[0]++;
      arr2[1].bar++;
      foo.bar++;
      arr1[2].bar++;
      console.log(arr1[1] === arr2[0]);//
      console.log(arr1[2] === arr2[1]);//
      console.log(foo.bar);//