Element-ui中el-tabs的下划线样式微调

1.页面加载周期结束之后调用方法

mounted: function () {
    this.handleClick()
},

2.写这个方法

handleClick () {
      this.resetActivePosition(this.$refs.tabs.$el)
    },
 resetActivePosition ($el) { // tabs的样式修改
      this.$nextTick(() => {
        const activeEl = $el.querySelector(.el-tabs__item.is-active);
        const lineEl = $el.querySelector(.el-tabs__active-bar);
        const style = getComputedStyle(activeEl);
        const pl = style.paddingLeft.match(/d+/)[0] * 1;
        const pr = style.paddingRight.match(/d+/)[0] * 1;
        const w = style.width.match(/d+/)[0] * 1;
        lineEl.style.transform = translateX( + (activeEl.offsetLeft + pl) + px);
        lineEl.style.width = (w - pl - pr) + px;
      })
  },

3.el-tabs上绑定ref就可以了

<el-tabs ref="tabs" v-model="activeName" @tab-click="handleClick" class="tabs">
            <!-- <el-tab-pane :label="体检项目 + info.xm  + 项" name="first"> -->
            <el-tab-pane label="体检项目" name="first">
              <div class="tab1">
                <!-- <el-table style="width: 100%;height: 80%;overflow: auto;"   ref="multipleTable" :data="tjxmList" tooltip-effect="dark"> -->
                <el-table ref="multipleTable" height="calc(100vh - 240px)" border style="width: 100%" :data="info.tjxmList" tooltip-effect="dark">
                  <el-table-column type="selection">
                  </el-table-column>
                  <el-table-column label="项目" sortable prop="mc">
                  </el-table-column>
                  <el-table-column label="原价" sortable prop="xmdj">
                  </el-table-column>
                  <el-table-column label="折扣" sortable>
                  </el-table-column>
                  <el-table-column label="实价" sortable>
                  </el-table-column>
                  <el-table-column label="付费方式" sortable>
                  </el-table-column>
                  <el-table-column label="科室" sortable>
                  </el-table-column>
                  <el-table-column label="状态" sortable prop="zt">
                  </el-table-column>
                  <el-table-column label="操作">
                    <template slot-scope="scope">
                      <el-button v-if="!scope.row.children" type="text" size="small" style="color: #f56c6c" @click="delfw(scope.row)">删除</el-button>
                    </template>
                  </el-table-column>
                </el-table>
                <div class="operater">
                  <span class="operater_left">登记人：{
         
  { info.xm }}/<span class="tj_color">{
         
  { info.cjsj }}</span></span>
                  <span class="operater_left">共计{
         
  { info.tjxmList ? info.tjxmList.length : 0 }}项 | 总价：<span class="tj_color">{
         
  { totalPrice }}元</span>
                    <!-- 已收：<span class="tj_color">300.00元</span> 待收：<span class="tj_color">200.00元</span>--> </span>
                  <span class="operater_btns">
                    <!-- <el-button type="btns">删除</el-button> -->
                    <el-button type="btns" @click="addTc">添加</el-button>
                    <el-button type="btns">套餐</el-button>
                  </span>
                </div>
              </div>
            </el-tab-pane>
            <el-tab-pane label="收费信息" name="second">收费信息</el-tab-pane>
            <el-tab-pane label="历史体检(3次)" name="third">历史体检</el-tab-pane>
            <el-tab-pane label="科室检查(5/10)" name="fourth">科室检查</el-tab-pane>
            <el-tab-pane label="操作记录(50)" name="five">操作记录</el-tab-pane>
          </el-tabs>

4.结果：下划线就可以向左边偏移一点了，看起来更好看