17 - 计数器

[shenrui1]

// 你的答案

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

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

/**
 * Implement the composable function
 * Make sure the function works correctly
 */
function useCounter(initialValue = 0, options: UseCounterOptions = {}) {
  const { min, max } = options;
  if (initialValue > max) {
    initialValue = max;
  } else if (initialValue < min) {
    initialValue = min;
  }
  const count = ref(initialValue);
  const inc = () => {
    if (count.value < max) {
      count.value++;
    }
  };
  const dec = () => {
    if (count.value > 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>