element-ui中Table表格省市区合并单元格的方法实现

<template>
 <div>
  <el-form :inline="true" :model="forminline" class="demo-form-inline">
   <el-form-item label="搜索">
    <el-input v-model="forminline.search" placeholder="搜索"></el-input>
   </el-form-item>
   <el-form-item>
    <el-button type="primary" @click="onsubmit">查询</el-button>
   </el-form-item>
  </el-form>
  <el-table
   :data="tabledata"
   border
   v-loading="loading"
   element-loading-text="拼命加载中"
   element-loading-spinner="el-icon-loading"
   element-loading-background="rgba(0, 0, 0, 0.8)"
   :span-method="arrayspanmethod"
   style="width: 100%">
   <el-table-column
    prop="province"
    label="省"
    width="150">
   </el-table-column>
   <el-table-column
    prop="city"
    label="市"
    width="150">
   </el-table-column>
   <el-table-column
    prop="zone"
    label="区"
    width="150">
   </el-table-column>
   <el-table-column
    prop="remake"
    label="备注">
    <template slot-scope="scope">
     <template v-if="scope.row.edit">
      <el-input class="edit-input" size="small" v-model="scope.row.remake"></el-input>
     </template>
     <span v-else>{{ scope.row.remake }}</span>
    </template>
   </el-table-column>
   <el-table-column
    prop="publicsubsidy"
    sortable
    label="国补"
    width="150">
    <template slot-scope="scope">
     <template v-if="scope.row.edit">
      <el-input class="edit-input" size="small" v-model="scope.row.publicsubsidy"></el-input>
     </template>
     <span v-else>{{ scope.row.publicsubsidy }}</span>
    </template>
   </el-table-column>
   <el-table-column
    prop="provincesubsidy"
    sortable
    label="省补"
    width="150">
    <template slot-scope="scope">
     <template v-if="scope.row.edit">
      <el-input class="edit-input" size="small" v-model="scope.row.provincesubsidy"></el-input>
     </template>
     <span v-else>{{ scope.row.provincesubsidy }}</span>
    </template>
   </el-table-column>
   <el-table-column
    prop="citysubsidy"
    sortable
    label="市补"
    width="150">
    <template slot-scope="scope">
     <template v-if="scope.row.edit">
      <el-input class="edit-input" size="small" v-model="scope.row.citysubsidy"></el-input>
     </template>
     <span v-else>{{ scope.row.citysubsidy }}</span>
    </template>
   </el-table-column>
   <el-table-column align="center" label="actions" width="200">
    <template slot-scope="scope">
     <el-button v-if="scope.row.edit" type="success" @click="confirmedit(scope.row)" size="small"
           icon="el-icon-circle-check-outline">ok
     </el-button>
     <el-button v-if="scope.row.edit" class='cancel-btn' size="small" icon="el-icon-refresh" type="warning"
           @click="canceledit(scope.row)">cancel
     </el-button>
     <el-button v-else type="primary" @click='scope.row.edit=!scope.row.edit' size="small" icon="el-icon-edit">
      edit
     </el-button>
    </template>
   </el-table-column>
  </el-table>
 </div>
</template>
<script>
 import axios from 'axios'
 export default {
  name: "city",
  data() {
   return {
    tabledata: [], //table的数据
    originaldata: [],//table数据备份
    provincearr: [], //省份要合并数组 [2,0,1,3,0,0] 代表第一二行合并,第三行不变,第四五六行合并,0代表原本的那一行被合并,因此这个列被消除
    provincepos: 0, //省份要合并数组内容的序号
    cityarr: [], //同上 市
    citypos: [],
    zonearr: [],//同上 区
    zonepos: [],
    forminline: { //form表单
     search: ''
    },
    loading: false
   }
  },
  created() {
   this.init()
  },
  methods: {
   init() {
    this.loading = true;
    axios.get('./static/table.json')
     .then(res => {
      this.loading = false;
      this.tabledata = res.data.map((v, index) => {
       this.$set(v, 'edit', false) //增加一个新的属性

       //可以修改的属性值,进行添加一个对应的原本值
       v.originalremake = v.remake;
       v.originalpublics = v.publicsubsidy;
       v.originalprovinces = v.provincesubsidy;
       v.originalcitys = v.citysubsidy;
       return v
      })
      this.originaldata = this.tabledata;
      this.merage() //合并的方法
     })
     .catch(e => {
      console.log(e)
     })
   },
   canceledit(row) {
    //取消编辑,把原本值进行覆盖回来
    row.remake = row.originalremake
    row.publicsubsidy = row.originalpublics
    row.provincesubsidy = row.originalprovinces
    row.citysubsidy = row.originalcitys
    row.edit = false
    this.$message({
     message: 'the title has been restored to the original value',
     type: 'warning'
    })
   },
   confirmedit(row) {
    row.edit = false

    //把新的值,覆盖原本值,以防再次修改
    row.originalremake = row.remake
    row.originalpublics = row.publicsubsidy
    row.originalprovinces = row.provincesubsidy
    row.originalcitys = row.citysubsidy
    this.$message({
     message: 'the title has been edited',
     type: 'success'
    })
   },
   arrayspanmethod({row, column, rowindex, columnindex}) {
    if (columnindex === 0) {
     //第一列的合并方法,省
     const _row_1 = this.provincearr[rowindex];
     const _col_1 = _row_1 > 0 ? 1 : 0; //如果被合并了_row=0则它这个列需要取消
     return {
      rowspan: _row_1,
      colspan: _col_1
     }
    } else if (columnindex === 1) {
     //第二列的合并方法,市
     const _row_2 = this.cityarr[rowindex];
     const _col_2 = _row_2 > 0 ? 1 : 0;
     return {
      rowspan: _row_2,
      colspan: _col_2
     }
    } else if (columnindex === 2) {
     //第三列的合并方法,区
     const _row_3 = this.zonearr[rowindex];
     const _col_3 = _row_3 > 0 ? 1 : 0;
     return {
      rowspan: _row_3,
      colspan: _col_3
     }
    }
   },
   merage() {
    //要合并的数组的方法
    this.merageinit();
    for (var i = 0; i < this.tabledata.length; i++) {
     if (i === 0) {
      //第一行必须存在
      this.provincearr.push(1);
      this.provincepos = 0;

      this.cityarr.push(1);
      this.citypos = 0;
      this.zonearr.push(1);
      this.zonepos = 0;
     }
     else {
      // 判断当前元素与上一个元素是否相同 this.provincepos是provincearr内容的序号

      //省
      if (this.tabledata[i].province === this.tabledata[i - 1].province) {
       this.provincearr[this.provincepos] += 1;
       this.provincearr.push(0);
      } else {
       this.provincearr.push(1);
       this.provincepos = i;
      }

      //市
      if (this.tabledata[i].city === this.tabledata[i - 1].city && this.tabledata[i].province === this.tabledata[i - 1].province) {
       this.cityarr[this.citypos] += 1;
       this.cityarr.push(0);
      } else {
       this.cityarr.push(1);
       this.citypos = i;
      }

      //区
      if (this.tabledata[i].zone === this.tabledata[i - 1].zone && this.tabledata[i].city === this.tabledata[i - 1].city && this.tabledata[i].province === this.tabledata[i - 1].province) {
       this.zonearr[this.zonepos] += 1;
       this.zonearr.push(0);
      } else {
       this.zonearr.push(1);
       this.zonepos = i;
      }
     }
    }
   },
   merageinit() {
    //初始化省市区的合并行的数组
    this.provincearr = [];
    this.provincepos = 0;
    this.cityarr = [];
    this.citypos = 0;
    this.zonearr = [];
    this.zonepos = 0;
   },
   onsubmit() {
    const filterdata = this.originaldata; //每次过滤之前都要把筛选之前的tabledata重置
    this.tabledata = filterdata.filter(value => {
     if (this.forminline.search === value.province || this.forminline.search === value.city || this.forminline.search === value.zone) {
      return value;
     } else if (this.forminline.search === '') {
      return value;
     } else if (value.province.includes(this.forminline.search) || value.city.includes(this.forminline.search) || value.zone.includes(this.forminline.search)) {
      return value;
     }
    })
    this.merage();
   }
  }
 }
</script>
<style scoped>
</style>

[
 {
  "province": "浙江省",
  "city": "杭州市",
  "zone": "余杭区",
  "type": "icbc",
  "remake": "2017-2018年期间建成并网的分布式光伏",
  "publicsubsidy": "0.37",
  "provincesubsidy": "0.1",
  "citysubsidy": "0.1"
 },
 {
  "province": "浙江省",
  "city": "杭州市",
  "zone": "余杭区",
  "type": "dwe",
  "remake": "对居民住宅单独建设的光伏发电项目",
  "publicsubsidy": "0.37",
  "provincesubsidy": "0.1",
  "citysubsidy": "0."
 },
 {
  "province": "浙江省",
  "city": "杭州市",
  "zone": "萧山区",
  "type": "dwe",
  "remake": "对居民住宅单独建设的光伏发电项目",
  "publicsubsidy": "0.37",
  "provincesubsidy": "0.1",
  "citysubsidy": "0."
 },
 {
  "province": "安徽省",
  "city": "阜阳市",
  "zone": "太和县",
  "type": "all",
  "remake": "对居民住宅单独建设的光伏发电项目",
  "publicsubsidy": "0.37",
  "provincesubsidy": "0.2",
  "citysubsidy": "0.1"
 },
 {
  "province": "安徽省",
  "city": "合肥市",
  "zone": "蜀山区",
  "type": "all",
  "remake": "对居民住宅单独建设的光伏发电项目",
  "publicsubsidy": "0.37",
  "provincesubsidy": "0.2",
  "citysubsidy": "0.1"
 },
 {
  "province": "安徽省",
  "city": "合肥市",
  "zone": "庐阳区",
  "type": "all",
  "remake": "对居民住宅单独建设的光伏发电项目",
  "publicsubsidy": "0.37",
  "provincesubsidy": "0.2",
  "citysubsidy": "0.1"
 },
 {
  "province": "浙江省",
  "city": "杭州市",
  "zone": "西湖区",
  "type": "all",
  "remake": "2017-2018年期间建成并网的分布式光伏",
  "publicsubsidy": "0.37",
  "provincesubsidy": "0.1",
  "citysubsidy": "0.2"
 },
 {
  "province": "浙江省",
  "city": "嘉兴市",
  "zone": "海盐县",
  "type": "all",
  "remake": "对居民住宅单独建设的光伏发电项目",
  "publicsubsidy": "0.37",
  "provincesubsidy": "0.2",
  "citysubsidy": "0.1"
 }
]