关于日期下拉菜单的点击事件，我是在点击打开下拉菜单时才把点击监听事件挂上去，当点击其他区域的时候再把监听事件移除
所以导致eventMap.click为空
这种情况应该怎样再模拟点击之后再把监听事件挂上去？

toggleDropdown = (e) => {
      e.preventDefault()
      
      if ( !this.state.isOpen ) {
          this.setState({
              isOpen: true
          })
          // if the clicked element is not this element, then close the dropdown menu
          document.addEventListener('mouseup', this.handleClikeOutSide)
      } else {
          this.closeComponent()
      }
}
handleClikeOutSide = (e) => {
      const onClickItem = e.target.className.includes('dropdown-item')
      const onClickToggle = e.target.className.includes('dropdown-toggle')
      if ( !onClickItem && !onClickToggle ) {
          this.closeComponent()
      }
}

closeComponent = () => {
      this.setState({
          isOpen: false
      })
      document.removeEventListener('mouseup', this.handleClikeOutSide)
      this.props.onChange({year: this.state.selectedYear, month: this.state.selectedMonth})
}