vue js滚动到顶部底部

this.$nextTick(() => {
          this.ulDom = this.$refs.ul//高度不固定的子级元素，高度大于父级
          this.divDom = this.$refs.scrollcon//固定高度的父级元素
 })
 this.$nextTick(()=>{
                console.log(this.ulDom.offsetHeight)
                this.divDom.scrollTop = this.ulDom.offsetHeight
              })