element-ui穿梭框使用问题

Question

使用element-ui穿梭框组件，从又往左，无法移动数据

transfer.js?7836:1022 Uncaught TypeError: currentValue.splice is not a function
  at eval (transfer.js?7836:1022)
  at Array.forEach (<anonymous>)
  at VueComponent.addToLeft (transfer.js?7836:1019)
  at click (transfer.js?7836:280)
  at invoker (vue.esm.js?efeb:2027)
  at HTMLButtonElement.fn._withTask.fn._withTask (vue.esm.js?efeb:1826)