作用：实现数字的动画展示效果

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使用步骤：

1. 安装

   npm i countup.js
   

2. 导入

   import { CountUp } from 'countUps';
   

3. HTML结构

   <span ref="countup1Ref">{{ props.number1 }}</span>
   <span ref="countup2Ref">{{ props.number2 }}</span>
   

4. 创建实例

   const countup1Ref = ref<HTMLElement>();
   const countup2Ref = ref<HTMLElement>();
   onMounted(() => {const countup1 = new CountUp(countup1Ref.value!, props.number1, {duration: 2, //* 持续时间});countup1.start();const countup2 = new CountUp(countup2Ref.value!, props.number2, {duration: 2, //* 持续时间});countup1.start();countup2.start();
   });