elementui的table字母、数字、汉字混合排序

<el-table-column label="盈亏金额" min-width="25%" sortable :sort-method="sortDevName" prop="profitOrLoss" align="center" class="flex_1">
     <template slot-scope="scope">
            <el-tag :type="scope.row.profitOrLoss!==0? scope.row.profitOrLoss.indexOf('+')!==-1?'success':'danger':'info'">
              {{scope.row.profitOrLoss}}
            </el-tag>
     </template>
</el-table-column>

// 字母数字混合排序
sortDevName(val1, val2) {
  let str1 = String(val1.profitOrLoss)
  let str2 = String(val2.profitOrLoss)
  let res = 0
  for (let i = 0; ; i++) {
    if (!str1[i] || !str2[i]) {
      res = str1.length - str2.length
      break
    }
    const char1 = str1
    const char1Type = this.getChartType(char1)
    const char2 = str2
    const char2Type = this.getChartType(char2)
    // 类型相同的逐个比较字符
    if (char1Type[0] === char2Type[0]) {
      if (char1 === char2) {
        continue
      } else {
        if (char1Type[0] === 'zh') {
          res = char1.localeCompare(char2)
        } else if (char1Type[0] === 'en') {
          res = char1.charCodeAt(0) - char2.charCodeAt(0)
        } else {
          res = char1 - char2
        }
        break
      }
    } else {
      // 类型不同的，直接用返回的数字相减
      res = char1Type[1] - char2Type[1]
      break
    }
  }
  return res
},
getChartType(char) {
  // 数字可按照排序的要求进行自定义，我这边产品的要求是
  // 数字（0->9）->大写字母（A->Z）->小写字母（a->z）->中文拼音（a->z）
  if (/^[\u4e00-\u9fa5]$/.test(char)) {
    return ['zh', 300]
  }
  if (/^[a-zA-Z]$/.test(char)) {
    return ['en', 200]
  }
  if (/^[0-9]$/.test(char)) {
    return ['number', 100]
  }
  return ['others', 999]
},