<template>
 <div>
 <div class="show" v-show="show" v-clickoutside="handleClose">
  显示
 </div>
 </div>
</template>

<script>
const clickoutside = {
 // 初始化指令
  bind(el, binding, vnode) {
    function documentHandler(e) {
  // 这里判断点击的元素是否是本身，是本身，则返回
      if (el.contains(e.target)) {
        return false;
  }
  // 判断指令中是否绑定了函数
      if (binding.expression) {
  // 如果绑定了函数 则调用那个函数，此处binding.value就是handleClose方法
        binding.value(e);
      }
 }
 // 给当前元素绑定个私有变量，方便在unbind中可以解除事件监听
    el.__vueClickOutside__ = documentHandler;
    document.addEventListener('click', documentHandler);
  },
  update() {},
  unbind(el, binding) {
 // 解除事件监听
    document.removeEventListener('click', el.__vueClickOutside__);
    delete el.__vueClickOutside__;
  },
};
export default {
  name: 'HelloWorld',
  data() {
    return {
      show: true,
    };
  },
  directives: {clickoutside},
  methods: {
    handleClose(e) {
      this.show = false;
    },
  },
};
</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
.show {
  width: 100px;
  height: 100px;
  background-color: red;
}
</style>