vue中循环遍历实现点击单选多选功能

      #list {
        float: left;
        padding: 8px;
        border: 1px solid #4686f2;
        margin-right: 8px;
        cursor: pointer;
        position: relative;
      }
      .activeClass::before {
        content: "";
        position: absolute;
        right: 0;
        bottom: 0;
        border: 8px solid #4686f2;
        border-top-color: transparent;
        border-left-color: transparent;
      }
      .activeClass::after {
        content: "";
        position: absolute;
        width: 3px;
        height: 6px;
        right: 1px;
        bottom: 0px;
        border: 2px solid #fff;
        border-top-color: transparent;
        border-left-color: transparent;
        transform: rotate(45deg);
      }