防止多次点击，做节流处理

默认间隔时间 3000

<button v-preventReClick="1000" @click="count++">点我加一</button>

//防多次点击，重复提交
Vue.directive('preventReClick', {
  inserted(el, binding) {
    el.addEventListener('click', () => {
      if (!el.disabled) {
        el.disabled = true
        setTimeout(() => {
          el.disabled = false
        }, binding.value || 3000)
      }
    })
  }
})