 
import Vue from 'vue'
Vue.directive('loadmore', {
    bind(el, binding) {
        const SELECTWRAP_DOM = el.querySelector('.el-select-dropdown .el-select-dropdown__wrap')
        SELECTWRAP_DOM.addEventListener('scroll', function () {
            const CONDITION = this.scrollHeight - this.scrollTop <= this.clientHeight
            if (CONDITION) {
                binding.value()
            }
        })
    }
}) 
