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We investigate the $B^+\to J/\psi \phi K^+$ decay via various rescatteringdiagrams. Without introducing genuine exotic resonances, it is shown that the$Z_{cs}(4000)$, $Z_{cs}(4220)$ and $X(4700)$ reported by the LHCb collaborationcan be simulated by the $J/\psi K^{*+}$, $\psi^\prime K^+$ and $\psi^\prime\phi$ threshold cusps, respectively. These cusps are enhanced by some nearbytriangle singularities. The $X(4685)$ with $J^P=1^+$ cannot be well simulatedby the threshold effects in our model, which implies that it may be a genuineresonance.

Threshold effects as the origin of $Z_{cs}(4000)$, $Z_{cs}(4220)$ and $X(4700)$ observed in $B^+\to J/\psi \phi K^+$