css3实现平行四边形框效果

 

<div class="parallelogram-page">
  <a href="" class="first-page active"><span>1</span></a>
  <a href="" class="middle-page"><span>2</span></a>
  <a href="" class="middle-page"><span>3</span></a>
  <a href="" class="middle-page"><span>4</span></a>
  <a href="" class="middle-page"><span>5</span></a>
  <a href="" class="next-page"><span>next</span></a>
  <div>···</div>
  <a href="" class="last-page"><span>last</span></a>
</div>
.parallelogram-page{
  &::after{
    display: block;
    content: '';
    clear: both;
  }
  a{
    display: block;
    float: left;
    height: 20px;
    margin-right: 10px;
    text-decoration: none;
    background: #00c0a5;
    &.active, &:hover{
      color: #fff;
    }
  }
  div{
    float: left;
  }
  .middle-page{
     40px;
    transform-origin: 0 0;
    transform: skew(30deg);
    position: relative;
    span{
      display: block;
      transform-origin: 0 0;
      transform: skew(-30deg);
      position: relative;
      left: 22px;
    }
  }
  .first-page{
     30px;
    position: relative;
    margin-right: 12px;
    span{
      display: block;
      text-align: center;
    }
    &::after{
      display: inline-block;
      content: '';
      position: absolute;
      top: 0;
      right: -12px;
      border-top: 10px solid transparent;
      border-right: 6px solid transparent;
      border-bottom: 10px solid #00c0a5;
      border-left: 6px solid #00c0a5;
    }
  }
  .next-page{
     40px;
    position: relative;
    margin-left: 12px;
    &::before{
      display: inline-block;
      content: '';
      position: absolute;
      top: 0;
      left: -12px;
      border-top: 10px solid #00c0a5;
      border-right: 6px solid #00c0a5;
      border-bottom: 10px solid transparent;
      border-left: 6px solid transparent;
    }
    span{
      display: block;
      text-align: center;
    }
  }
  .last-page{
     40px;
    span{
      display: block;
      text-align: center;
    }
  }
}

示例二：

 <div class="parallelogram-page">
      <a class="first-page" :class="{active:activeNav===1}" @click="activeNav=1"><span>日志管理</span></a>
      <a class="middle-page" style="border-left: 2px solid #E9EFF4;" :class="{active:activeNav===2}" @click="activeNav=2"><span>操作日志</span></a>
      <a class="middle-page" :class="{active:activeNav===3}" @click="activeNav=3"><span>系统日志</span></a>
    </div>



// 导航============开始
.parallelogram-page{
  background-color: #F7F9FB;
  &::after{
    display: block;
    content: '';
    clear: both;
  }
  a{
    display: block;
    float: left;
    height: 36px;
    line-height: 36px;
    // margin-right: 10px;
    text-decoration: none;
    background: #F7F9FB;
    &.active{
      color: #323c47;
      background: #fff;
    }
  }
  div{
    float: left;
  }
  .middle-page{
     150px;
    transform-origin: 0 0;
    transform: skew(40deg);
    position: relative;
    left: -12px;
    border-right: 2px solid #E9EFF4;
    span{
      display: block;
      transform-origin: 0 0;
      transform: skew(-40deg);
      position: relative;
      left: 22px;
      cursor: pointer;
    }
  }
  .first-page{
     150px;
  }
  .first-page.active{
     150px;
    position: relative;
    margin-right: 12px;
    span{
      display: block;
      text-align: center;
      cursor: pointer;
    }
    &::after{
      display: inline-block;
      content: '';
      position: absolute;
      top: 0px;
      right: -30px;
      border-top: 18px solid transparent;
      border-right: 16px solid transparent;
      border-bottom: 18px solid #fff;
      border-left: 14px solid #fff;
    }
  }
  .next-page{
     150px;
    position: relative;
    margin-left: 12px;
    &::before{
      display: inline-block;
      content: '';
      position: absolute;
      top: 0;
      left: -12px;
      border-top: 10px solid #fff;
      border-right: 6px solid #fff;
      border-bottom: 10px solid transparent;
      border-left: 6px solid transparent;
    }
    span{
      display: block;
      text-align: center;
    }
  }
  .last-page{
     150px;
    span{
      display: block;
      text-align: center;
    }
  }
}

// 导航============结束