el-table排序

https://www.cnblogs.com/steamed-twisted-roll/p/11069821.html

https://blog.csdn.net/qq_39186346/article/details/103861876

纯大写字母排序

 <el-table-column
          :show-overflow-tooltip="true"
          align="center"
          prop="fen2"
          label="总分"
          sortable
        ></el-table-column>

// 评分等级排序函数
    sortDev(obj1, obj2){
      if(obj1.fen3=='A+'||obj2.fen3=='A+'){
        if(obj1.fen3=='A+'){
          return 1;
        }else{
          return -1;
        }
      }
       
    },