17 - 计数器

[Ly-TiR]

<script setup lang='ts'>
import { ref } from 'vue';

interface UseCounterOptions {
  min?: number
  max?: number
}

/**
 * 实现计数器函数,确保功能正常工作
 * 1. 加 (+)
 * 2. 减 (-)
 * 3. 重置 
 * 4. 最小值 & 最大值 选项支持
*/

function useCounter(initialValue = 0, options: UseCounterOptions = {}) {
  let count = ref(initialValue)

  const inc = () => {
    if (count.value < options.max) count.value++;
  }

  const dec = () => {
    if (count.value > options.min) count.value--;
  }

  const reset = () => {
    count.value = initialValue
  }

  return {
    count,
    inc,
    dec,
    reset
  }
}

const { count, inc, dec, reset } = useCounter(0, { min: 0, max: 10 })

</script>

<template>
  <p>Count: {{ count }}</p>
  <button @click="inc">
    inc
  </button>
  <button @click="dec">
    dec
  </button>
  <button @click="reset">
    reset
  </button>
</template>