el-select 无限下拉滚动加载数据

selectLoadMore.js
export default {
  directives: {
    'loadmore': {
      bind(el, binding) {
        const SELECT_DOM = el.querySelector('.el-select-dropdown .el-select-dropdown__wrap')
        SELECT_DOM.addEventListener('scroll', function() {
          const condition = this.scrollHeight - this.scrollTop <= this.clientHeight
          if (condition) binding.value()
        })
      }
    }
  }
}