countUp.js に基づいて Vue3 にデジタル スクロール プラグインを実装する方法

npm i countup.js

export interface CountUpOptions {
    startVal?: number;
    decimalPlaces?: number;
    duration?: number;
    useGrouping?: boolean;
    useIndianSeparators?: boolean;
    useEasing?: boolean;
    smartEasingThreshold?: number;
    smartEasingAmount?: number;
    separator?: string;
    decimal?: string;
    easingFn?: (t: number, b: number, c: number, d: number) => number;
    formattingFn?: (n: number) => string;
    prefix?: string;
    suffix?: string;
    numerals?: string[];
    enableScrollSpy?: boolean;
    scrollSpyDelay?: number;
    scrollSpyOnce?: boolean;
    onCompleteCallback?: () => any;
    plugin?: CountUpPlugin;
}
export declare interface CountUpPlugin {
    render(elem: HTMLElement, formatted: string): void;
}
export declare class CountUp {
    private endVal;
    options?: CountUpOptions;
    version: string;
    private defaults;
    private rAF;
    private startTime;
    private remaining;
    private finalEndVal;
    private useEasing;
    private countDown;
    el: HTMLElement | HTMLInputElement;
    formattingFn: (num: number) => string;
    easingFn?: (t: number, b: number, c: number, d: number) => number;
    error: string;
    startVal: number;
    duration: number;
    paused: boolean;
    frameVal: number;
    once: boolean;
    constructor(target: string | HTMLElement | HTMLInputElement, endVal: number, options?: CountUpOptions);
    handleScroll(self: CountUp): void;
    /**
     * Smart easing works by breaking the animation into 2 parts, the second part being the
     * smartEasingAmount and first part being the total amount minus the smartEasingAmount. It works
     * by disabling easing for the first part and enabling it on the second part. It is used if
     * usingEasing is true and the total animation amount exceeds the smartEasingThreshold.
     */
    private determineDirectionAndSmartEasing;
    start(callback?: (args?: any) => any): void;
    pauseResume(): void;
    reset(): void;
    update(newEndVal: string | number): void;
    count: (timestamp: number) => void;
    printValue(val: number): void;
    ensureNumber(n: any): boolean;
    validateValue(value: string | number): number;
    private resetDuration;
    formatNumber: (num: number) => string;
    easeOutExpo: (t: number, b: number, c: number, d: number) => number;
}

<script setup lang="ts">
  import { CountUp } from &#39;countup.js&#39;
  import type { CountUpOptions } from &#39;countup.js&#39;
  import { onMounted, ref } from &#39;vue&#39;

  let numAnim = ref(null) as any
  const countupRef = ref()
  const props = defineProps({
    end: {
      type: Number,
      default: 0
    },
    options: {
      type: Object,
      validator(option: Object) {
        let keys = [&#39;startVal&#39;, &#39;decimalPlaces&#39;, &#39;duration&#39;, &#39;useGrouping&#39;, &#39;useEasing&#39;, &#39;smartEasingThreshold&#39;, &#39;smartEasingAmount&#39;, &#39;separator&#39;, &#39;decimal&#39;, &#39;prefix&#39;, &#39;suffix&#39;, &#39;numerals&#39;]
        for (const key in option) {
          if (!keys.includes(key)) {
            console.error(" CountUp 传入的 options 值不符合 CountUpOptions")
            return false
          }
        }
        return true
      },
      default() {
        let options: CountUpOptions = {
          startVal: 0, // 开始的数字  一般设置0开始
          decimalPlaces: 2, // number类型 小数位，整数自动添.00
          duration: 2, // number类型 动画延迟秒数，默认值是2
          useGrouping: true, // boolean类型  是否开启逗号，默认true(1,000)false(1000)
          useEasing: true,  // booleanl类型 动画缓动效果(ease),默认true
          smartEasingThreshold: 500, // numberl类型 大于这个数值的值开启平滑缓动
          smartEasingAmount: 300, // numberl类型
          separator: &#39;,&#39;,// string 类型 分割用的符号
          decimal: &#39;.&#39;, // string 类型  小数分割符合
          prefix: &#39;&#39;, // sttring 类型  数字开头添加固定字符
          suffix: &#39;&#39;, // sttring类型 数字末尾添加固定字符
          numerals: []  // Array类型 替换从0到9对应的字，也就是自定数字字符了,数组存储
        }
        return options
      }
    }
  })
  onMounted(() => {
    initCount()
  })
  const initCount = () => {
    numAnim = new CountUp(countupRef.value, props.end, props.options)
    numAnim.start()
  }

  defineExpose({
    initCount
  })
</script>

<template>
  <span ref="countupRef"></span>
</template>

<style scoped lang=&#39;scss&#39;></style>