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Inawebpagewithchechboxesyouneedtowriteejquerythatretrunsthenumbercheckedcheckboxes.()A.varn=$（“input：checked”）.length；B.varn=$（“：input，：checked”）.length；C.varn=$（“input：selected”）.length；D.varn=$（“：input，：selected”）.length；
题目
Inawebpagewithchechboxesyouneedtowriteejquerythatretrunsthenumbercheckedcheckboxes.()
A.varn=$（“input：checked”）.length；
B.varn=$（“：input，：checked”）.length；
C.varn=$（“input：selected”）.length；
D.varn=$（“：input，：selected”）.length；