根据业务需求，有时候需要在没有数据的情况下，显示合计，如图所示：

viewui-table-summary.png

ViewUI Table是不支持的，修改了源码（table.vue和summary.vue中的template内容），仅供参考

table.vue

<template>
    <div :class="wrapClasses" :style="styles" ref="tableWrap">
        <div :class="classes">
            <div :class="[prefixCls + '-title']" v-if="showSlotHeader" ref="title"><slot name="header"></slot></div>
            <div :class="[prefixCls + '-header']" v-if="showHeader" ref="header" @mousewheel="handleMouseWheel">
                <table-head
                    :prefix-cls="prefixCls"
                    :styleObject="tableHeaderStyle"
                    :columns="cloneColumns"
                    :column-rows="columnRows"
                    :obj-data="objData"
                    :columns-width="columnsWidth"
                    :data="rebuildData"></table-head>
            </div>
            <div :class="[prefixCls + '-body']" :style="bodyStyle" ref="body" @scroll="handleBodyScroll"
                v-show="!((!!localeNoDataText && (!data || data.length === 0)) || (!!localeNoFilteredDataText && (!rebuildData || rebuildData.length === 0)))">
                <table-body
                    ref="tbody"
                    :draggable="draggable"
                    :prefix-cls="prefixCls"
                    :styleObject="tableStyle"
                    :columns="cloneColumns"
                    :data="rebuildData"
                    :row-key="rowKey"
                    :columns-width="columnsWidth"
                    :obj-data="objData"></table-body>
            </div>
            
            <div
                :class="[prefixCls + '-tip']" :style="bodyStyle" @scroll="handleBodyScroll"
                v-show="((!!localeNoDataText && (!data || data.length === 0)) || (!!localeNoFilteredDataText && (!rebuildData || rebuildData.length === 0)))">
                <table cellspacing="0" cellpadding="0" border="0">
                    <tbody>
                        <tr>
                            <td :style="{'height':bodyStyle.height,'width':`${this.headerWidth}px`}">
                                <span v-html="localeNoDataText" v-if="!data || data.length === 0"></span>
                                <span v-html="localeNoFilteredDataText" v-else></span>
                            </td>
                        </tr>
                    </tbody>
                </table>
            </div>
            <table-summary
                v-if="showSummary"
                ref="summary"
                :prefix-cls="prefixCls"
                :styleObject="tableStyle"
                :columns="cloneColumns"
                :data="summaryData"
                :columns-width="columnsWidth"
            />
            <div :class="[prefixCls + '-fixed']" :style="fixedTableStyle" v-if="isLeftFixed">
                <div :class="fixedHeaderClasses" v-if="showHeader">
                    <table-head
                        fixed="left"
                        :prefix-cls="prefixCls"
                        :styleObject="fixedTableStyle"
                        :columns="leftFixedColumns"
                        :column-rows="columnRows"
                        :fixed-column-rows="leftFixedColumnRows"
                        :obj-data="objData"
                        :columns-width="columnsWidth"
                        :data="rebuildData"></table-head>
                </div>
                <div :class="[prefixCls + '-fixed-body']" :style="fixedBodyStyle" ref="fixedBody" @mousewheel="handleFixedMousewheel" @DOMMouseScroll="handleFixedMousewheel">
                    <table-body
                        fixed="left"
                        :draggable="draggable"
                        :prefix-cls="prefixCls"
                        :styleObject="fixedTableStyle"
                        :columns="leftFixedColumns"
                        :data="rebuildData"
                        :row-key="rowKey"
                        :columns-width="columnsWidth"
                        :obj-data="objData"></table-body>
                </div>
                <table-summary
                    v-if="showSummary"
                    fixed="left"
                    :prefix-cls="prefixCls"
                    :styleObject="fixedTableStyle"
                    :columns="leftFixedColumns"
                    :data="summaryData"
                    :columns-width="columnsWidth"
                    :style="{ 'margin-top': showHorizontalScrollBar ? scrollBarWidth + 'px' : 0 }"
                />
            </div>
            <div :class="[prefixCls + '-fixed-right']" :style="fixedRightTableStyle" v-if="isRightFixed">
                <div :class="fixedHeaderClasses" v-if="showHeader">
                    <table-head
                        fixed="right"
                        :prefix-cls="prefixCls"
                        :styleObject="fixedRightTableStyle"
                        :columns="rightFixedColumns"
                        :column-rows="columnRows"
                        :fixed-column-rows="rightFixedColumnRows"
                        :obj-data="objData"
                        :columns-width="columnsWidth"
                        :data="rebuildData"></table-head>
                </div>
                <div :class="[prefixCls + '-fixed-body']" :style="fixedBodyStyle" ref="fixedRightBody" @mousewheel="handleFixedMousewheel" @DOMMouseScroll="handleFixedMousewheel">
                    <table-body
                        fixed="right"
                        :draggable="draggable"
                        :prefix-cls="prefixCls"
                        :styleObject="fixedRightTableStyle"
                        :columns="rightFixedColumns"
                        :data="rebuildData"
                        :row-key="rowKey"
                        :columns-width="columnsWidth"
                        :obj-data="objData"></table-body>
                </div>
                <table-summary
                    v-if="showSummary"
                    fixed="right"
                    :prefix-cls="prefixCls"
                    :styleObject="fixedRightTableStyle"
                    :columns="rightFixedColumns"
                    :data="summaryData"
                    :columns-width="columnsWidth"
                    :style="{ 'margin-top': showHorizontalScrollBar ? scrollBarWidth + 'px' : 0 }"
                />
            </div>
            <div :class="[prefixCls + '-fixed-right-header']" :style="fixedRightHeaderStyle" v-if="isRightFixed"></div>
            <div :class="[prefixCls + '-footer']" v-if="showSlotFooter" ref="footer"><slot name="footer"></slot></div>
        </div>
        <div class="ivu-table-resize-line" v-show="showResizeLine" ref="resizeLine"></div>
        <div class="ivu-table-context-menu" :style="contextMenuStyles" v-if="showContextMenu">
            <Dropdown trigger="custom" :visible="contextMenuVisible" transfer @on-clickoutside="handleClickContextMenuOutside">
                <DropdownMenu slot="list">
                    <slot name="contextMenu"></slot>
                </DropdownMenu>
            </Dropdown>
        </div>
        <Spin fix size="large" v-if="loading">
            <slot name="loading"></slot>
        </Spin>
    </div>
</template>

<template>
    <div style="overflow:hidden;">
        <table class="ivu-table-summary" cellspacing="0" cellpadding="0" border="0" :style="styleObject">
            <colgroup>
                <col v-for="(column, index) in columns" :width="setCellWidth(column)">
            </colgroup>
            <tbody :class="[prefixCls + '-tbody']">
                <tr class="ivu-table-row">
                    <td v-for="(column, index) in columns" :class="alignCls(column)">
                        <div class="ivu-table-cell" :class="cellCls(column)">
                            <span v-if="data[column.key] != undefined">{{ data[column.key].value }}</span>
                        </div>
                    </td>
                </tr>
            </tbody>
        </table>
    </div>
</template>