element-ui中的clickoutside点击空白隐藏元素

<template>
  <div class="app">
    <div v-show="isShowBox" v-clickoutside="closeBox" class="box"></div>
  </div>
</template>
<script>
import Clickoutside from 'element-ui/src/utils/clickoutside'
export default {
  directives: {
    Clickoutside
  },
  data() {
    return {
      isShowBox: true
    }
  },
  methods: {
    closeBox() {
      this.isShowBox = false;
    }
  }
};

import Vue from 'vue';
import { on } from 'element-ui/src/utils/dom';
const nodeList = [];
const ctx = '@@clickoutsideContext';
let startClick;
let seed = 0;
on(document, 'mousedown', e => (startClick = e));
on(document, 'mouseup', e => {
  nodeList.forEach(node => node[ctx].documentHandler(e, startClick));
});
function createDocumentHandler(el, binding, vnode) {
  return function(mouseup = {}, mousedown = {}) {
    if (!vnode ||
      !vnode.context ||
      !mouseup.target ||
      !mousedown.target ||
      el.contains(mouseup.target) ||
      el.contains(mousedown.target) ||
      el === mouseup.target ||
      (vnode.context.popperElm &&
      (vnode.context.popperElm.contains(mouseup.target) ||
      vnode.context.popperElm.contains(mousedown.target)))) return;
    if (binding.expression &&
      el[ctx].methodName &&
      vnode.context[el[ctx].methodName]) {
      vnode.context[el[ctx].methodName]();
    } else {
      el[ctx].bindingFn && el[ctx].bindingFn();
    }
  };
}
/**
 * v-clickoutside
 * @desc 点击元素外面才会触发的事件
 * @example
 * ```vue
 * <div v-element-clickoutside="handleClose">
 * ```
 */
export default {
  bind(el, binding, vnode) {
    nodeList.push(el);
    const id = seed++;
    el[ctx] = {
      id,
      documentHandler: createDocumentHandler(el, binding, vnode),
      methodName: binding.expression,
      bindingFn: binding.value
    };
  },
  update(el, binding, vnode) {
    el[ctx].documentHandler = createDocumentHandler(el, binding, vnode);
    el[ctx].methodName = binding.expression;
    el[ctx].bindingFn = binding.value;
  },
  unbind(el) {
    let len = nodeList.length;
    for (let i = 0; i < len; i++) {
      if (nodeList[i][ctx].id === el[ctx].id) {
        nodeList.splice(i, 1);
        break;
      }
    }
    delete el[ctx];
  }
};