ElementUI：el-tabs 切换之前判断是否满足条件

   <div class="table-card">
      <div class="card-steps-class">
        <el-tabs
          v-model="activeTabsIndex"
          :before-leave="beforeHandleTabsClick"
        >
          <el-tab-pane name="1" label="基础设置">
            <span slot="label">
              <span class="span-box">
                <el-tooltip
                  class="item"
                  effect="dark"
                  content="基础设置 "
                  placement="bottom-start"
                >
                  <i class="el-icon-question"></i>
                </el-tooltip>
                <span>基础设置</span>
              </span>
            </span>
          </el-tab-pane>
          <el-tab-pane name="2" label="流程设计">
            <span slot="label">
              <span class="span-box">
                <el-tooltip
                  class="item"
                  eff