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showPopper(val) {
  val ? this.updatePopper() : this.destroyPopper();
  this.$emit('input', val);
}

  this.appended = true;

  for (let item in element.attributes) {
    if (/^_v-/.test(element.attributes[item].name)) {   //为什么这里需要剔除v-开头的属性呢
      hash = element.attributes[item].name;
      break;
    }
  }

  const arrow = document.createElement('div');

  if (hash) {
    arrow.setAttribute(hash, '');
  }
  arrow.setAttribute('x-arrow', '');
  arrow.className = 'popper__arrow';
  element.appendChild(arrow);
}