it was written under the guidance of Daniel of our company. But I don't seem to understand it very well. I'll give you the code

                <el-table-column prop="orderCount" label="">
                    <template slot-scope="{row,$index}">
                        <div  @click="{{chengenum($index)}}">
                        <el-input v-if="editable[$index]" v-model='grade'></el-input>
                        <span v-else>{{row.orderCount}}</span>
                        </div>
                    </template>
                </el-table-column>
                //

                            let arr = _this.tableData = list_date.list; //_this.tableData
                            let len = arr.length;
                            
                            new Array(len)
                            
                            _this.editable = new Array(len);
//                            _this.editabl
data(){
editable:[],
}
//
            chengenum(row){
                this.editable[row] = true;
                this.$set(this.editable,row,true)
            },

 <span class='abc' @click="setEdit($event)" >{{scope.row.orderCount}}</span>
setEdit(event){
    let target=event.target;
   //targetcontenteditabletrue

and add target's blur event listener to update its value
}

A Boolean value to control whether he is editable