要用createElement 创建才能加上

     render: (h, params) => {
                            let create = this.$createElement
                            let dom= create(expandRow,{
                                props: {
                                    row: params.row
                                },
                                on:{
                                    'my-clear':()=>{
                                        this.clearChoose();
                                    }
                                },
                                ref:'chargeSmall'+params.index

                            })
                            return dom

                        }