<el-table-column
prop="dealPrice"
label="成交单价"
>
<template
slot="header"
slot-scope="scope"
>
成交单价
<el-tooltip
class="item"
effect="dark"
content="成交单价=单价-商品优惠金额/购买数量"
placement="top"
>
<i class="el-icon-info"></i>
</el-tooltip>
</template>
</el-table-column>
搞定~