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JS开发小应用:实现钱包余额数字跳动效果

作者:Terry2021.12.24来源:Web前端之家浏览:4702评论:0
关键词:js

 

介绍一个用原生Javascript实现的小应用:实现钱包余额数字跳动效果。这种效果平时项目中也经常会用到,可能大家会在前端框架里使用更多了点,今天我们脱离框架,用原生的去实现。先看下效果图:

QQ截图20211224110620.png

实现思路

1、当默认进来的时候,可以设置一个数字,通常是:0.00,或者你也可以设计成其他

2、然后过1秒或者几秒数字变成最终的余额。

实现方法

首先我们得写一个插件,由于时间原因,这里就不啰嗦,直接发出来。

/**
        * 实现数字滚动的效果的类
        */
        class DigitScroll {
            constructor(options) {
                //获取容器的DOM,没有则抛出错误
                this.container = document.querySelector(options.container);
                if (!this.container) {
                throw Error("no container");
                }
                this.container.style.overflow = "hidden";
                this.container.style.display = "flex";
                //可视容器高度 也是滚动间隔距离,容器要设置高度,否则默认30px
                this.rollHeight = parseInt(getComputedStyle(this.container).height) || 30;
                this.container.style.height = this.rollHeight + "px";
            }
            roll(num) {
                // 将传入的要滚动的数字拆分后初始化每一位数字的容器
                this.initDigitEle(num);
                const numEles = this.container.querySelectorAll(".single-num");
                // 遍历生成每一位数字的滚动队列,如滚动到7,则生成内容为0,1,2,3,4,5,6,7的7个div,用于滚动动画
                [...numEles].forEach((numEle, index) => {
                const curNum = 0;
                let targetNum = Number(this.numberArr[index]);
                if (curNum >= targetNum) {
                    targetNum = targetNum + 10;
                }
                let cirNum = curNum;
                // 文档碎片,拼凑好后一次性插入节点中
                const fragment = document.createDocumentFragment();
                // 生成从0到目标数字对应的div
                while (targetNum >= cirNum) {
                    const ele = document.createElement("div");
                    ele.innerHTML = cirNum % 10;
                    cirNum++;
                    fragment.appendChild(ele);
                }
                numEle.innerHTML = "";
                numEle.appendChild(fragment);
                //重置位置
                numEle.style.cssText +=
                    "-webkit-transition-duration:0s;-webkit-transform:translateY(0)";
                setTimeout(() => {
                    numEle.style.cssText += `-webkit-transition-duration:1s;-webkit-transform:translateY(${
                    -(targetNum - curNum) * this.rollHeight
                    }px);`;
                }, 50);
                });
            }
            // 初始化容器
            initDigitEle(num) {
                // 数字拆分位数
                const numArr = num.toString().split("");
                // 文档碎片,拼凑好后一次性插入节点中
                const fragment = document.createDocumentFragment();
                numArr.forEach((item) => {
                const el = document.createElement("div");
                // 数字是要滚动的,非数字如.是不滚动的
                if (/[0-9]/.test(item)) {
                    el.className = "single-num";
                    el.style.height = this.rollHeight + "px";
                    el.style.lineHeight = this.rollHeight + "px";
                } else {
                    el.innerHTML = item;
                    el.className = "no-move";
                    el.style.verticalAlign = "bottom";
                }
                // el.style.float='left';
                fragment.appendChild(el);
                }, []);
                this.container.innerHTML = "";
                this.container.appendChild(fragment);
                // 存储滚动的数字
                this.numberArr = numArr.filter((item) => /[0-9]/.test(item));
            }
}

这个是我们定义的一个类,里面包含了需要的一些函数方法。

接下来我们需要调用他们。

// 应用上面定义的函数        
const digitInstance = new DigitScroll({container:"#digit-scroll"});
digitInstance.roll(88.88);
setTimeout(() => {
   digitInstance.roll(3578.48);
}, 5000);

最后大家可以去定义下样式,写点CSS啥的。最后分享下完整的代码:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>JS开发小应用:实现钱包余额数字跳动效果 | Web前端之家www.jiangweishan.com</title>
    <style>
        .wrapper{
          display: flex;
        }
        #digit-scroll{
          display: flex;
          justify-content: center;
          color: #f50;
        }
    </style>
</head>
<body>
    <div class="wrapper">您的钱包余额(元):<div id="digit-scroll"></div></div>
    <script>
        /**
        * 实现数字滚动的效果的类
        */
        class DigitScroll {
            constructor(options) {
                //获取容器的DOM,没有则抛出错误
                this.container = document.querySelector(options.container);
                if (!this.container) {
                throw Error("no container");
                }
                this.container.style.overflow = "hidden";
                this.container.style.display = "flex";
                //可视容器高度 也是滚动间隔距离,容器要设置高度,否则默认30px
                this.rollHeight = parseInt(getComputedStyle(this.container).height) || 30;
                this.container.style.height = this.rollHeight + "px";
            }
            roll(num) {
                // 将传入的要滚动的数字拆分后初始化每一位数字的容器
                this.initDigitEle(num);
                const numEles = this.container.querySelectorAll(".single-num");
                // 遍历生成每一位数字的滚动队列,如滚动到7,则生成内容为0,1,2,3,4,5,6,7的7个div,用于滚动动画
                [...numEles].forEach((numEle, index) => {
                const curNum = 0;
                let targetNum = Number(this.numberArr[index]);
                if (curNum >= targetNum) {
                    targetNum = targetNum + 10;
                }
                let cirNum = curNum;
                // 文档碎片,拼凑好后一次性插入节点中
                const fragment = document.createDocumentFragment();
                // 生成从0到目标数字对应的div
                while (targetNum >= cirNum) {
                    const ele = document.createElement("div");
                    ele.innerHTML = cirNum % 10;
                    cirNum++;
                    fragment.appendChild(ele);
                }
                numEle.innerHTML = "";
                numEle.appendChild(fragment);
                //重置位置
                numEle.style.cssText +=
                    "-webkit-transition-duration:0s;-webkit-transform:translateY(0)";
                setTimeout(() => {
                    numEle.style.cssText += `-webkit-transition-duration:1s;-webkit-transform:translateY(${
                    -(targetNum - curNum) * this.rollHeight
                    }px);`;
                }, 50);
                });
            }
            // 初始化容器
            initDigitEle(num) {
                // 数字拆分位数
                const numArr = num.toString().split("");
                // 文档碎片,拼凑好后一次性插入节点中
                const fragment = document.createDocumentFragment();
                numArr.forEach((item) => {
                const el = document.createElement("div");
                // 数字是要滚动的,非数字如.是不滚动的
                if (/[0-9]/.test(item)) {
                    el.className = "single-num";
                    el.style.height = this.rollHeight + "px";
                    el.style.lineHeight = this.rollHeight + "px";
                } else {
                    el.innerHTML = item;
                    el.className = "no-move";
                    el.style.verticalAlign = "bottom";
                }
                // el.style.float='left';
                fragment.appendChild(el);
                }, []);
                this.container.innerHTML = "";
                this.container.appendChild(fragment);
                // 存储滚动的数字
                this.numberArr = numArr.filter((item) => /[0-9]/.test(item));
            }
        }

        // 应用上面定义的函数        
        const digitInstance = new DigitScroll({container:"#digit-scroll"});
        digitInstance.roll(88.88);
        setTimeout(() => {
            digitInstance.roll(3578.48);
        }, 5000);

    </script>
</body>
</html>

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