el-select 添加romte后不显示下拉箭头

1、给el-slelect添加类名如：my-select

2 、.my-select {

  /deep/.el-select__caret::before {

    content: "\e6e1";

  }

  /deep/.is-focus {

    .el-select__caret:first-child {

      transform: rotateZ(0deg);

    }

  }

}