官方文档

<template slot="header" slot-scope="scope">
    <el-input
    v-model="search"
    size="mini"
    placeholder="输入关键字搜索"/>
</template>

修改将slot-scope="scope"改为slot-scope="{}"

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解决方案来源:https://blog.csdn.net/weixin_45622961/article/details/115892405