react 不用插件实现数字滚动的效果示例

突然要实现个数字滚动效果，网上一搜，一大堆都是用组件的。我只是想实现个简单的效果而已，决定还是自己搞搞吧。

先来看看效果吧

也不多说了，实现起来不难，但是有点细节问题需要自己好好琢磨一下

大概思路，

1.一开始为0，获取第一次数据，记录下来

2.和前一次数据进行对比

3.然后transform

4.最后收工

好了，附上代码、

export default class Number extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      prev: "000000",//初始化6位数
      next: "000000",
      inits: 0,
      listAll: [[0],[0],[0],[0],[0],[0]],
      contrlAnimationWay: false
    }
    this.key1 = 0
  }

  componentWillUnmount() {
  }
  componentDidMount() {
    setTimeout(()=>{
      this.run()
    })
    // this.setTimer()
  }


  // 获取数据
  getNumber() {
    let { inits } = this.state
    let random = Math.floor(Math.random() * (100000 - 1) + 1);
    let prev = this.addZero(inits, 6)
    let next = this.addZero(inits + 1235, 6)
    this.setState({
      inits: inits + 1235
    })
    console.log(99, prev);
    console.log(99, next);
    this.getData(prev, next)
  }
  // 数字补零
  addZero(num, n) {
    let len = num.toString().length;
    while (len < n) {
      num = "0" + num;
      len++;
    }
    return num;
  }
  // 对比数据前后变化
  getData(prev, next) {
    let { listAll } = this.state
    listAll = [];
    let prevArray = prev.toString().split("");
    let nextArray = next.toString().split("");
    console.log(11, prevArray);
    console.log(22, nextArray);
    let listInit = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9];

    for (let i = 0; i < prevArray.length; i++) {
      let prevNumber = parseInt(prevArray[i]);
      let nextNumber = parseInt(nextArray[i]);
      let start = -1;
      let end = -1;

      for (let j = 0; j < listInit.length; j++) {
        if (listInit[j] === prevNumber) {
          start = j;
        }
        if (start !== -1 && listInit[j] === nextNumber) {
          end = j;
          break;
        }
      }
      listAll.push(listInit.slice(start, end + 1));
      console.log(listAll);
    }
    this.setState({
      listAll
    })
  }
  run() {
    this.getNumber()
    this.key1++
  }
  setTimer() {
    setInterval(() => {
      setTimeout(()=>{
        this.run()
      }, 0);
    }, 1000 * 4)
  }

  render() {
    let { listAll } = this.state;
    return <div className="new-tmall911">
      {/* 数字滚动 */}
      <div className="box-number">
        <div onClick={this.setTimer.bind(this)}>累计</div>
        {
          listAll.map((list, i) => {
            return <div key={i} className="list-wrap">
              <div className={`roll roll_${list.length - 1}`} key={this.key1++}>
                {
                  list.map((item, index) => {
                    return <div key={index}>
                      {item}
                    </div>
                  })
                }
              </div>
            </div>
          })
        }
        <div>人已参与</div>
      </div>
      {/* 数字end */}
    </div>
  }
}

css

/* 数字滚动 */
.box-number {
  /* background: green; */
  display: flex;
  flex-direction: row;
  justify-content: center;
  align-items: center;
  color: rgb(36, 35, 35);
  height: 100px
 }

 .list-wrap {
  height: 3rem;
  width: 3rem;
  text-align: center;
  overflow: hidden;
  margin: 0.1rem;
  border: 2px rgb(19, 19, 18) solid;
  border-radius: 2px;
 }

 .roll div {
  font-size: 2rem;
  line-height: 3rem;
 }

 .roll_1 {
  -webkit-animation: roll_1 2s forwards; /* Safari 与 Chrome */
 }
 .roll_2 {
  -webkit-animation: roll_2 2s forwards; /* Safari 与 Chrome */
 }

 .roll_3 {
  -webkit-animation: roll_3 2s forwards; /* Safari 与 Chrome */
 }

 .roll_4 {
  -webkit-animation: roll_4 2s forwards; /* Safari 与 Chrome */
 }

 .roll_5 {
  -webkit-animation: roll_5 2s forwards; /* Safari 与 Chrome */
 }

 .roll_6 {
  -webkit-animation: roll_6 2s forwards; /* Safari 与 Chrome */
 }

 .roll_7 {
  -webkit-animation: roll_7 2s forwards; /* Safari 与 Chrome */
 }

 .roll_8 {
  -webkit-animation: roll_8 2s forwards; /* Safari 与 Chrome */
 }
 
 /*省略roll_2——roll_8*/

 .roll_9 {
  -webkit-animation: roll_9 2s forwards; /* Safari 与 Chrome */
 }

 @-webkit-keyframes roll_1 /* Safari 与 Chrome */
 {
  0% {
   transform: translate3d(0, 0, 0);
  }
  100% {
   transform: translate3d(0, -3rem, 0);
  }
 }

 @-webkit-keyframes roll_2 /* Safari 与 Chrome */
 {
  0% {
   transform: translate3d(0, 0px, 0);
  }
  100% {
   transform: translate3d(0, -6rem, 0);
  }
 }
 @-webkit-keyframes roll_3 /* Safari 与 Chrome */
 {
  0% {
   transform: translate3d(0, 0px, 0);
  }
  100% {
   transform: translate3d(0, -9rem, 0);
  }
 }
 @-webkit-keyframes roll_4 /* Safari 与 Chrome */
 {
  0% {
   transform: translate3d(0, 0px, 0);
  }
  100% {
   transform: translate3d(0, -12rem, 0);
  }
 }
 @-webkit-keyframes roll_5 /* Safari 与 Chrome */
 {
  0% {
   transform: translate3d(0, 0px, 0);
  }
  100% {
   transform: translate3d(0, -15rem, 0);
  }
 }
 @-webkit-keyframes roll_6 /* Safari 与 Chrome */
 {
  0% {
   transform: translate3d(0, 0px, 0);
  }
  100% {
   transform: translate3d(0, -18rem, 0);
  }
 }
 @-webkit-keyframes roll_7 /* Safari 与 Chrome */
 {
  0% {
   transform: translate3d(0, 0px, 0);
  }
  100% {
   transform: translate3d(0, -21rem, 0);
  }
 }
 @-webkit-keyframes roll_8 /* Safari 与 Chrome */
 {
  0% {
   transform: translate3d(0, 0px, 0);
  }
  100% {
   transform: translate3d(0, -24rem, 0);
  }
 }
 @-webkit-keyframes roll_9 /* Safari 与 Chrome */
 {
  0% {
   transform: translate3d(0, 0px, 0);
  }
  100% {
   transform: translate3d(0, -27rem, 0);
  }
 } 

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