构建实用型Web开发工具：从需求到实现的完整指南

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<template>
  <div class="tool-container">
    <div class="input-section">
      <label for="input-text">输入文本</label>
      <textarea
        id="input-text"
        v-model="inputText"
        @input="generateHash"
        placeholder="请输入要生成MD5的文本"
      />
    </div>

    <div class="output-section">
      <label>MD5 结果</label>
      <div class="result-box">
        <code>{{ md5Result }}</code>
        <button
          @click="copyToClipboard"
          :disabled="!md5Result"
          class="copy-btn"
        >
          复制
        </button>
      </div>
    </div>
  </div>
</template>

<script setup>
import { ref, watch } from 'vue'
import md5 from 'md5'

const inputText = ref('')
const md5Result = ref('')

const generateHash = () => {
  if (inputText.value) {
    md5Result.value = md5(inputText.value)
  } else {
    md5Result.value = ''
  }
}

const copyToClipboard = async () => {
  try {
    await navigator.clipboard.writeText(md5Result.value)
    // 显示复制成功提示
  } catch (err) {
    console.error('复制失败:', err)
  }
}
</script>

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// stores/calculator.js
import { defineStore } from 'pinia'

export const useCalculatorStore = defineStore('calculator', {
  state: () => ({
    principal: 0,
    rate: 0,
    time: 0,
    result: 0,
    history: []
  }),

  getters: {
    monthlyReturn: (state) => {
      return (state.principal * state.rate / 100 / 12).toFixed(2)
    }
  },

  actions: {
    calculate() {
      this.result = this.principal * (1 + this.rate / 100) ** this.time
      this.history.push({
        timestamp: Date.now(),
        input: {
          principal: this.principal,
          rate: this.rate,
          time: this.time
        },
        result: this.result
      })
    }
  }
})

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.tool-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

@media (max-width: 768px) {
  .tool-container {
    padding: 10px;
  }

  .input-section,
  .output-section {
    width: 100%;
    margin-bottom: 15px;
  }
}

.grid-layout {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}

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<template>
  <button
    @click="handleSubmit"
    :class="{ 'loading': isLoading }"
    :disabled="isLoading"
  >
    <span v-if="isLoading">处理中...</span>
    <span v-else>生成结果</span>
  </button>

  <Transition name="fade">
    <div v-if="showSuccess" class="success-message">
      操作成功！
    </div>
  </Transition>
</template>

<style>
.fade-enter-active,
.fade-leave-active {
  transition: opacity 0.3s ease;
}

.fade-enter-from,
.fade-leave-to {
  opacity: 0;
}

.success-message {
  position: fixed;
  top: 20px;
  right: 20px;
  background: #4caf50;
  color: white;
  padding: 12px 24px;
  border-radius: 4px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.1);
}
</style>

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// 对于大型库，使用动态导入
const loadLibrary = async () => {
  if (!libraryLoaded.value) {
    const module = await import('some-heavy-library')
    library.value = module.default
    libraryLoaded.value = true
  }
  return library.value
}

// 在组件中使用
const handleCompute = async () => {
  const lib = await loadLibrary()
  // 使用库进行计算
}

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import { debounce } from 'lodash-es'

const debouncedCalculate = debounce((value) => {
  // 执行计算
  performCalculation(value)
}, 300)

// 在模板中使用
watch(inputValue, (newValue) => {
  debouncedCalculate(newValue)
})

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<template>
  <div class="roi-calculator">
    <h1>投资回报率计算器</h1>

    <div class="calculator-form">
      <div class="form-group">
        <label>初始投资金额（元）</label>
        <input
          type="number"
          v-model.number="form.principal"
          @input="calculate"
        >
      </div>

      <div class="form-group">
        <label>年化收益率（%）</label>
        <input
          type="number"
          v-model.number="form.rate"
          step="0.1"
          @input="calculate"
        >
      </div>

      <div class="form-group">
        <label>投资期限（年）</label>
        <input
          type="number"
          v-model.number="form.years"
          @input="calculate"
        >
      </div>

      <div class="form-group">
        <label>计算方式</label>
        <select v-model="form.method" @change="calculate">
          <option value="compound">复利</option>
          <option value="simple">单利</option>
        </select>
      </div>
    </div>

    <div class="result-section" v-if="result.totalAmount > 0">
      <h2>计算结果</h2>
      <div class="result-grid">
        <div class="result-item">
          <span class="label">最终金额</span>
          <span class="value">¥{{ formatCurrency(result.totalAmount) }}</span>
        </div>
        <div class="result-item">
          <span class="label">总收益</span>
          <span class="value profit">¥{{ formatCurrency(result.profit) }}</span>
        </div>
        <div class="result-item">
          <span class="label">收益率</span>
          <span class="value">{{ result.profitRate.toFixed(2) }}%</span>
        </div>
      </div>

      <div class="chart-container">
        <canvas ref="chartCanvas"></canvas>
      </div>
    </div>
  </div>
</template>

<script setup>
import { ref, reactive, computed, nextTick, onMounted } from 'vue'
import { Chart } from 'chart.js'

// 响应式数据
const form = reactive({
  principal: 10000,
  rate: 5,
  years: 1,
  method: 'compound'
})

const result = reactive({
  totalAmount: 0,
  profit: 0,
  profitRate: 0
})

const chartCanvas = ref(null)
let chartInstance = null

// 计算逻辑
const calculate = () => {
  const { principal, rate, years, method } = form

  if (!principal || !rate || !years) {
    resetResult()
    return
  }

  let totalAmount

  if (method === 'compound') {
    // 复利计算
    totalAmount = principal * Math.pow(1 + rate / 100, years)
  } else {
    // 单利计算
    totalAmount = principal * (1 + rate / 100 * years)
  }

  const profit = totalAmount - principal
  const profitRate = (profit / principal) * 100

  Object.assign(result, {
    totalAmount,
    profit,
    profitRate
  })

  // 更新图表
  updateChart()
}

const resetResult = () => {
  Object.assign(result, {
    totalAmount: 0,
    profit: 0,
    profitRate: 0
  })
}

// 格式化货币
const formatCurrency = (value) => {
  return new Intl.NumberFormat('zh-CN', {
    minimumFractionDigits: 2,
    maximumFractionDigits: 2
  }).format(value)
}

// 图表更新
const updateChart = async () => {
  if (!chartCanvas.value) return

  await nextTick()

  const chartData = generateChartData()

  if (chartInstance) {
    chartInstance.data = chartData
    chartInstance.update()
  } else {
    chartInstance = new Chart(chartCanvas.value, {
      type: 'line',
      data: chartData,
      options: {
        responsive: true,
        plugins: {
          title: {
            display: true,
            text: '投资增长曲线'
          }
        },
        scales: {
          y: {
            beginAtZero: true,
            ticks: {
              callback: (value) => '¥' + formatCurrency(value)
            }
          }
        }
      }
    })
  }
}

// 生成图表数据
const generateChartData = () => {
  const years = []
  const amounts = []

  for (let i = 0; i <= form.years; i++) {
    years.push(`第${i}年`)

    let amount
    if (form.method === 'compound') {
      amount = form.principal * Math.pow(1 + form.rate / 100, i)
    } else {
      amount = form.principal * (1 + form.rate / 100 * i)
    }

    amounts.push(amount)
  }

  return {
    labels: years,
    datasets: [{
      label: '投资金额',
      data: amounts,
      borderColor: 'rgb(75, 192, 192)',
      backgroundColor: 'rgba(75, 192, 192, 0.2)',
      tension: 0.1
    }]
  }
}

// 生命周期
onMounted(() => {
  calculate()
})
</script>

<style scoped>
.roi-calculator {
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
}

.calculator-form {
  background: #f5f5f5;
  padding: 20px;
  border-radius: 8px;
  margin-bottom: 30px;
}

.form-group {
  margin-bottom: 15px;
}

.form-group label {
  display: block;
  margin-bottom: 5px;
  font-weight: 500;
}

.form-group input,
.form-group select {
  width: 100%;
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 16px;
}

.result-section {
  background: white;
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin-bottom: 30px;
}

.result-item {
  text-align: center;
  padding: 15px;
  background: #f9f9f9;
  border-radius: 8px;
}

.result-item .label {
  display: block;
  font-size: 14px;
  color: #666;
  margin-bottom: 5px;
}

.result-item .value {
  display: block;
  font-size: 24px;
  font-weight: bold;
  color: #333;
}

.result-item .profit {
  color: #4caf50;
}

.chart-container {
  position: relative;
  height: 300px;
}

@media (max-width: 768px) {
  .result-grid {
    grid-template-columns: 1fr;
  }
}
</style>

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export default defineNuxtConfig({
  nitro: {
    minify: true,
    sourceMap: false
  },

  build: {
    transpile: ['chart.js']
  },

  css: ['~/assets/css/main.css'],

  head: {
    title: 'Util工具箱 - 实用开发工具集合',
    meta: [
      { name: 'description', content: '提供各种实用开发工具，提升开发效率' },
      { name: 'keywords', content: '开发工具,在线工具,效率工具' }
    ]
  }
})

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<script setup>
// 设置页面meta信息
useHead({
  title: '投资ROI计算器 - Util工具箱',
  meta: [
    {
      name: 'description',
      content: '在线投资回报率计算器，支持复利和单利计算，帮助您快速评估投资收益。'
    },
    {
      name: 'keywords',
      content: 'ROI计算器,投资回报率,复利计算,理财工具'
    }
  ],

  link: [
    {
      rel: 'canonical',
      href: 'https://util.ink/tools/investment-calculator'
    }
  ]
})
</script>