VueJS坎坷之路111---_self.$scopedSlots.default is not a function

VueJs + Element

话不多说，直接贴错：

_self.$scopedSlots.default is not a function

<el-table stripe border ref="tableData" max-height="500" v-loading="loading" v-bind:data="tableData" @row-dblclick="doubbleClick" row-key="new_srv_partsapplylineId" key="lines">
    <el-table-column type="selection" width="50" :selectable="isSelectedTable">
    </el-table-column>
    <el-table-column key="exchange" prop="exchange" :label="$t('attach.list_operate')">
    　　<template slot-scope="scope">
    　　　　<el-button type="text" @click="gotoChangePartPage(scope.row)">{{$t('partsApply.line_btn_changeparts')}}</el-button>
    　　</template>
    </el-table-column>
    <el-table-column key="new_partsid" prop="new_partsid.name" :label="$t('partsApply.line_filed_new_partsid')">
       <template slot-scope="scope">
        　　<el-button type="text" @click="gotoEditLinePage(scope.row)">{{scope.row.new_partsid.name}}</el-button>
    　　</template>
    </el-table-column>
    <el-table-column key="new_applyqty" prop="new_applyqty" :label="$t('partsApply.line_filed_new_applyqty')">
    </el-table-column>
    <el-table-column key="new_approvedqty" prop="new_approvedqty" :label="$t('partsApply.line_filed_new_approvedqty')" v-if="this.type == 2 || this.type == 3" width="100">
    　　<template slot-scope="scope">
    　　　　<el-input type="number" :id="scope.row.new_srv_partsapplylineId+'approve'" v-model="scope.row.new_approvedqty" :disabled="!isBtnAcceptEnable" min="0" @blur="qtyBlur(scope.row)"></el-input>
    　　</template>
    </el-table-column>
    <el-table-column key="new_confirmqty" prop="new_confirmqty" :label="this.type === 2 ? $t('partsApply.line_filed_new_assignqty') : $t('partsApply.line_filed_new_confirmqty')" width="100">
        <template slot-scope="scope">
        　　<el-input type="number" :id="scope.row.new_srv_partsapplylineId+'confirm'" v-model="scope.row.new_confirmqty" :disabled="!isBtnAcceptEnable" min="0" @blur="qtyBlur(scope.row)"></el-input>
        </template>
    </el-table-column>
    <el-table-column key="new_amount" prop="new_amount" :label="$t('partsApply.line_filed_new_amount')" v-if="this.type == 2 || this.type == 3">
    </el-table-column>
    <el-table-column key="new_iscontrolname" prop="new_iscontrolname" :label="$t('partsApply.line_filed_new_iscontrolname')" v-if="this.type == 1 || this.type == 3">
    </el-table-column>
    <el-table-column key="new_agentqty" prop="new_agentqty" :label="$t('partsApply.line_filed_new_agentqty')" v-if="this.type==2 || (this.type==3&&this.applyto==1">
    </el-table-column>
    <el-table-column key="new_servicecompanyqty" prop="new_servicecompanyqty" :label="$t('partsPurchaseOrSale.line_filed_new_servicecompanyqty')" v-if="this.type==3&&this.applyto==2">
    </el-table-column>
</el-table>

解决方法：

第一次，给<el-table>加上属性 key 失败

第二次，给<el-inpurt>加上属性 name 失败，加上 key 失败

第三次，给<el-table-column>加上属性 key 成功