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 8th day of May, 2012.

                                                  /s/ Gregory A. Russo
                                                  ------------------------------
                                                  Gregory A. Russo

                                  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 Strategic Diversified Income Fund
John Hancock Tax-Advantaged Dividend Income Fund
John Hancock Tax-Advantaged Global Shareholder Yield Fund