  We present a comprehensive study of a series of recurrent jets that occurred
at the periphery of the NOAA active region 12114 on 2014 July 7. These jets
were found to share the same source region and exhibited rotational motions as
they propagated outward. The multi-wavelength imaging observations made by the
AIA and {\it IRIS} telescopes reveal that some of the jets contain cool plasma
only, while some others contain not only cool but also hot plasma. The Doppler
velocities calculated from the {\it IRIS} spectra show a continuous evolution
from blue to red shifts as the jet motions change from upward to downward.
Additionally, some jets exhibit opposite Doppler shifts on their both sides,
indicative of rotating motions along their axes. The inclination angle and
three-dimensional velocity of the largest jet were inferred from the imaging
and spectroscopic observations, which show a high consistence with those
derived from the stereoscopic analysis using dual-perspective observations by
{\it SDO}/AIA and {\it STEREO}-B/EUVI. By relating the jets to the local UV/EUV
and full-disk {\it GOES} X-ray emission enhancements, we found that the
previous five small-scale jets were triggered by five bright points while the
last/largest one was triggered by a C1.6 solar flare. Together with a number of
type III radio bursts generated during the jet eruptions as well as a weak CME
that was observed in association with the last jet, our observations provide
evidences in support of multi-scale magnetic reconnection processes being
responsible for the production of jet events.
