throttle.js

import Vue from 'vue'
//节流
Vue.directive('throttle', {
    inserted: function (el, binding) {
        let [fn, event ='click', time = 300] = binding.value
        let timer, timer_end;
        el.addEventListener(event, () => {
            if (timer) {
                clearTimeout(timer_end)
                return timer_end = setTimeout(() => fn(), time)
            }
            fn()
            timer = setTimeout(() => timer = null, time)
        })
    }
})