初始化element-UI table 头部内容

<el-table-column label="标记" prop="tip" :render-header="renderTip">
export defult {
    data(){
        return{}
    },
    methods: {
        renderTip(h){
            return h('span', {}, [
                        h('span', {}, '标识'),
                        h('el-tooltip', {
                        props:{
                            class: "item" ,
                            effect: "dark",
                            content: "您可以对每个项目标记已读或未读，以方便记录查看历史",
                            placement: "top"
                        }},[
                            h('span', {class: 'iconfont icon-bangzhuzhongxin'})
                        ])
            ])
        }
    }
}