徒手写一个简单的步骤线

第一种：

template

<div class="per-mobile-step"
          v-for="(item,index) in steps"
          :key="item.value"
          @click="changeStep(item,index)"
          :class="[
            'per-mobile-step-'+index,
            item.value==currentcomponent?'active':'',
            index < currentcomponentindex?'active':''
          ]">
            <div class="title-dot">
              <i :class="[
                  item.value==currentcomponent?'active':'',
                  index < currentcomponentindex?'actived':''
                ]"></i>
              <div class="line" 
                :class="[
                  index < currentcomponentindex?'active':''
                ]" 
                v-if="index!==3"></div>
            </div>
            <div class="title-text"
            :class="[
              'title-text-'+index,
              item.value==currentcomponent?'active':'',
              index < currentcomponentindex?'active':''
            ]">{{item.label}}</div>
          </div>

上面的

index < currentcomponentindex?'active':''

为了记录当前步骤前的已完成的步骤，actived为已完成，active为当前展示步骤

js

data(){
    return{
      currentcomponent:"ac1",
      currentcomponentindex:0,
      steps:[
        {
          label:"身份验证",
          value:"ac1"
        },
        {
          label:"手机号绑定",
          value:"ac2"
        },
        {
          label:"设置密码",
          value:"ac3"
        },
        {
          label:"完成",
          value:"ac4"
        },
      ]
    }
  },

scss

// mobile
  .per-mobile-step{
    flex: 3;
    font-size: 0.8rem;
    line-height: 2;
    color: #e2e2e2;
    &.per-mobile-step-3{
      flex: 1;//最后一步没有线条，做了flex比例缩减
    }
    .title-dot{
      display: flex;
      align-items: center;
      >i{
        height: 10px;
        width: 10px;
        background: #e6e6e6;
        display: block;
        border-radius: 50%;
        &.active{
          background: #f39800;
          box-shadow: 0 0 0 3px #887963;
        }
        &.actived{
          background: #f39800;
          box-shadow: 0 0 0 3px #f39800;
        }
      }
      .line{
        flex: 1;
        height: 1px;
        background: #e6e6e6;
        &.active{
          background: #f39800;
        }
      }
    }
// 为了文字居中，包裹层向右边移动20px
// 字居中用relative做了偏移，有更好的方法代码请甩给我~
    .title-text{
      position: relative;
      margin-top: 5px;
      &.active{
          color: #edc462;
        }
    }
    .title-text-0{
      left: -20px;
    }
    .title-text-1{
      left: -23px;
    }
    .title-text-2{
      left: -20px;
    }
    .title-text-3{
      left: -10px;
    }
    
  }

第二种：

template

<div class="per-step"
          v-for="(item,index) in steps"
          :key="item.value"
          @click="changeStep(item,index)"
          :class="[
            index!==0?'before-trangle':'',
            index!==3?'after-trangle':'',
            'per-step-'+index,
            item.value==currentcomponent?'active':'',
            index < currentcomponentindex?'active':''
          ]">
            <span>{{item.label}}</span>
          </div>

scss

.per-step{
    flex: 1;
    text-align: center;
    background: rgba(0,0,0,.5);
    padding: 10px 0;
    margin: 0 20px;
    color: #fff;
    position: relative;
    height: 40px;
    cursor: pointer;
    &.active{
      background: rgba(0,84,165,.5);
    }
    &.before-trangle{
      margin-left: 40px;
      &::before{
        content: " ";
        width: 0px;
        height: 0px;
        position: absolute;
        top: 0;
        left: -40px;
        border: 20px solid rgba(0,0,0,.5);
        border-left-color: transparent;
      }
      &.active{
        &::before{
          border: 20px solid rgba(0,84,165,.5);
          border-left-color: transparent;
        }
      }
    }
    &.after-trangle{
      &::after{
        content: " ";
        width: 0px;
        height: 0px;
        position: absolute;
        top: 0;
        right: -40px;
        border: 20px solid transparent;
        border-left-color: rgba(0,0,0,.5);
      }
      &.active{
        &::after{
          border: 20px solid transparent;
          border-left-color: rgba(0,84,165,.5);
        }
      }
    }
    &.per-step-0{
      margin-left: 0;
    }
    &.per-step-3{
      margin-right: 0;
    }
  }