<div className="avatar-transform" ref={this.tmall}>
          {!!personAvatar.length && personAvatar.map((item, index) => {
            return <div className="avatar-wrap" key={index}>
              <div><img src={item.avatar} alt="" /></div>
              <div className="avatar-name">{item.nickname.substring(0, 2)}***已参与活动</div>
            </div>
          })}
        </div>

 changeCss(){
    if(this.index === 31){
      this.tmall.current.style = `transform: translateY(${this.index * 4}rem);`
      this.getAvatar()//获取数据
      this.index = 0
      return
    }
    this.tmall.current.style = `transform: translateY(-${this.index * 4}rem);transition: all 1s ease;`
    ++this.index
    setTimeout(()=>{
      this.changeCss()
    },3000)
  }

<div className="avatar-transform" ref={this.tmall}>
          {!!personAvatar.length && personAvatar.map((item, index) => {
            return <div className="avatar-wrap" key={index}>
              <div><img src={item.avatar} alt="" /></div>
              <div className="avatar-name">{item.nickname.substring(0, 2)}***已参与活动</div>
            </div>
          })}
        </div>

  getAvatar(target = false) { //获取数据
    http.get('********').json(r => {
      if (r.error) {
        return Alert(r.msg);
      }
      //判断一下，不是第一次请求
      if (target) {
        this.listData = r.users
        this.changeCss()
        return
      }
      //装起来
      this.listData = r.users
      this.setState({
        personAvatar: this.listData.splice(0, 5) //先来5个
      })
      //最开始是在下面的transform: translateY(7rem)，所以得上来
      this.tmall.current.style = `transform: translateY(0);transition: all 1s ease;`
      setTimeout(() => {
        this.changeCss()
      }, 3000)

    });
  }

.avatar-transform {

 transform: translateY(7rem);

}

  changeCss() {    
   let data = this.listData.shift()
    if (!data) {
      this.getAvatar(1)
      return
    }
    let div = document.createElement('div')
    div.className = "avatar-wrap"
    div.innerHTML = `<div><img src='${data.avatar}' alt="" /></div> 
    <div class="avatar-name">${data.nickname.substring(0, 2)}***已参与活动</div>`
    this.tmall.current.style = `transform: translateY(-${4}rem);transition: all 1s ease;`
    this.tmall.current.appendChild(div) //添加节点
    setTimeout(() => {
      this.tmall.current.style = `transform: translateY(0);`
      this.tmall.current.removeChild(this.tmall.current.childNodes[0]) //删除第一个节点
    }, 1000)
    setTimeout(() => {
      this.changeCss()
    }, 3000)

  }