解决vue elementUI中table里数字、字母、中文混合排序问题

<el-table
   ref="multipleTable"
   border
   tooltip-effect="dark"
   class="xg-table"
   style="width: 100%"
   max-height="600">
   <el-table-column
    type="selection"
    width="60" />
   <el-table-column
    :default-sort = "{prop: 'DevName'}"
    :sort-method="sortDevName"
    prop="DevName"
    label="名称"
    sortable
    show-overflow-tooltip />
</el-table>

<script>
  export default {
    methods: {
      sortDevName(str1, str2) {
       let res = 0
       for (let i = 0; ;i++) {
  if (!str1[i] || !str2[i]) {
   res = str1.length - str2.length
   break
  }
  const char1 = str1[i]
  const char1Type = this.getChartType(char1)
  const char2 = str2[i]
  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]
  }
    }
  }
</script>