  The mapping between the metal-insulator transition of the quantum Hall system
and a superfluid-to-insulator transition is revisited based on a disordered
anyon model. The one-parameter scaling of the superfluid-to-insulator
transition is employed for the analysis of the scaling behavior of the integer
quantum Hall transitions. The analysis reveals the direct transition from a
quantum Hall plateau to the insulator in weak disorder limit, and a float-down
transition for strong disorders. In either cases, the transition corresponds to
a non-chirality superfluid-to-insulator transition, with the longitudinal and
transverse quantum Hall conductivities following a semi-circle relation.
