POWER OF ATTORNEY

Know all by these presents, which the undersigned hereby constitutes and
appoints John J. Danello, Kinga Kapuscinski, Thomas M. Kinzler, Nicholas J.
Kolokithas, Julie B. Lyman, Patricia A. Morisette, Christopher Sechler, Betsy
Anne Seel, Steven Sunnerberg and Andrew Wilkins signing singly, the
undersigned's true and lawful attorneys-in-fact to:

      (1)   execute for and on behalf of the undersigned, in the undersigned's
            capacity as a trustee of the registered investment companies advised
            by John Hancock Advisers, LLC (the "Company") and set forth on
            Appendix A, Forms 3, 4, and 5 in accordance with Section 16(a) of
            the Securities Exchange Act of 1934 and the rules thereunder;

      (2)   do and perform any and all acts for and on behalf of the undersigned
            which may be necessary or desirable to complete and execute any such
            Form 3, 4, or 5, complete and execute any amendment or amendments
            thereto, and timely file such form with the United States Securities
            and Exchange Commission and any stock exchange or similar authority;
            and

      (3)   take any other action of any type whatsoever in connection with the
            foregoing which, in the opinion of such attorney-in-fact, may be of
            benefit to, in the best interest of, or legally required by, the
            undersigned, it being understood that the documents executed by such
            attorney-in-fact on behalf of the undersigned pursuant to this Power
            of Attorney shall be in such form and shall contain such terms and
            conditions as such attorney-in-fact may approve in such
            attorney-in-fact's discretion.

The undersigned hereby grants to such attorneys-in-fact full power and authority
to do and perform any and every act and thing whatsoever requisite, necessary,
or proper to be done in the exercise of any of the rights and powers herein
granted, as fully to all intents and purposes as the undersigned might or could
do if personally present, with full power of substitution or revocation, hereby
ratifying and confirming all that such attorney-in-fact, or such
attorney-in-fact's substitute or substitutes, shall lawfully do or cause to be
done by virtue of this power of attorney and the rights and powers herein
granted. The undersigned acknowledges that the foregoing attorneys-in-fact, in
serving in such capacity at the request of the undersigned, are not assuming,
nor is the Company assuming, any of the undersigned's responsibilities to comply
with Section 16 of the Securities Exchange Act of 1934.

This Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file Forms 3, 4, and 5 with respect to the
undersigned's holdings of and transactions in securities issued by the Company,
unless earlier revoked by the undersigned in a signed writing delivered to the
foregoing attorneys-in-fact.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of this 6th day of December, 2011.

                                            /s/ Steven R. Pruchansky
                                            ------------------------------------
                                            Steven R. Pruchansky



                                   APPENDIX A

John Hancock Bank and Thrift Opportunity Fund
John Hancock Emerging Markets Income Fund
John Hancock Flexible Income Opportunities Fund
John Hancock Income Securities Trust
John Hancock Investors Trust
John Hancock Hedged Equity & Income Fund
John Hancock Preferred Income Fund
John Hancock Preferred Income Fund II
John Hancock Preferred Income Fund III
John Hancock Premium Dividend Fund
John Hancock Tax-Advantaged Dividend Income Fund
John Hancock Tax-Advantaged Global Shareholder Yield Fund