提交按钮：用户点击多次，只有一次有效（多次提交只有一次有效）

<el-button
        v-if="showBtn !== 'no'"
        v-preventReClick
        style="width: 120px; backgroundColor: #007c84; color: #fff;marginLeft: 80px;"
        @click.stop="commitData"
        round
        >确定</el-button
>

Vue 指令：

directives: {
    'preventReClick': (el, binding) => {
      el.addEventListener('click', () => {
        if (!el.disabled) {
          el.disabled = true;
          setTimeout(() => {
            el.disabled = false;
          }, binding.value || 2500);
        }
      })
    }
  },