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pages/heightSdsCalculator/heightSdsCalculator.js

@@ -1,45 +1,106 @@
 const app = getApp();
-const math = require('../../utils/math.js');
+
+// 添加正态分布相关的数学函数
+const normalDistribution = {
+  // 误差函数的近似计算
+  erf(x) {
+    // 误差函数的系数
+    const a1 = 0.254829592;
+    const a2 = -0.284496736;
+    const a3 = 1.421413741;
+    const a4 = -1.453152027;
+    const a5 = 1.061405429;
+    const p = 0.3275911;
+
+    // 取绝对值
+    const sign = (x >= 0) ? 1 : -1;
+    x = Math.abs(x);
+
+    // 误差函数近似公式的计算
+    const t = 1.0 / (1.0 + p * x);
+    const y = 1.0 - (((((a5 * t + a4) * t) + a3) * t + a2) * t + a1) * t * Math.exp(-x * x);
+
+    return sign * y;
+  },
+
+  // 计算百分位数
+  calculatePercentile(sds) {
+    return (1 + this.erf(sds / Math.sqrt(2))) / 2 * 100;
+  }
+};
 
 Page({
   data: {
+    // 基础数据
     age: '',
     height: '',
     gender: 'male',
+    // 计算结果
     showResult: false,
     sdsValue: null,
-    percentile: null,
+    calculationDetails: null,
     growthEvaluation: '',
-    chartData: null
+    // 参考数据
+    standardData: {
+      male: [
+        { age: 1, mean: 76.5, sd: 3.0 },
+        { age: 2, mean: 88.5, sd: 3.5 },
+        { age: 3, mean: 96.8, sd: 3.8 },
+        { age: 4, mean: 103.5, sd: 4.2 },
+        { age: 5, mean: 110.0, sd: 4.5 },
+        { age: 6, mean: 116.5, sd: 4.8 },
+        { age: 7, mean: 124.0, sd: 5.0 },
+        { age: 8, mean: 129.5, sd: 5.2 },
+        { age: 9, mean: 134.5, sd: 5.5 },
+        { age: 10, mean: 138.5, sd: 5.8 },
+        { age: 11, mean: 143.0, sd: 6.0 },
+        { age: 12, mean: 150.0, sd: 6.5 },
+        { age: 13, mean: 156.5, sd: 7.0 },
+        { age: 14, mean: 163.0, sd: 7.2 },
+        { age: 15, mean: 168.0, sd: 6.2 },
+        { age: 16, mean: 171.5, sd: 5.8 },
+        { age: 17, mean: 173.5, sd: 5.5 },
+        { age: 18, mean: 174.5, sd: 5.2 }
+      ],
+      female: [
+        { age: 1, mean: 75.0, sd: 2.9 },
+        { age: 2, mean: 87.2, sd: 3.4 },
+        { age: 3, mean: 95.6, sd: 3.7 },
+        { age: 4, mean: 102.5, sd: 4.0 },
+        { age: 5, mean: 108.5, sd: 4.3 },
+        { age: 6, mean: 115.0, sd: 4.6 },
+        { age: 7, mean: 122.5, sd: 4.8 },
+        { age: 8, mean: 127.5, sd: 5.0 },
+        { age: 9, mean: 132.5, sd: 5.2 },
+        { age: 10, mean: 137.0, sd: 5.5 },
+        { age: 11, mean: 142.0, sd: 5.8 },
+        { age: 12, mean: 148.0, sd: 6.0 },
+        { age: 13, mean: 154.0, sd: 6.2 },
+        { age: 14, mean: 158.5, sd: 5.8 },
+        { age: 15, mean: 160.5, sd: 5.5 },
+        { age: 16, mean: 161.5, sd: 5.2 },
+        { age: 17, mean: 162.0, sd: 5.0 },
+        { age: 18, mean: 162.5, sd: 4.8 }
+      ]
+    }
   },
 
-  // 输入年龄
+  // 输入处理
   inputAge(e) {
     this.setData({
-      age: Number(e.detail.value) // 确保age是数字
+      age: Number(e.detail.value)
     });
   },
 
-  // 输入身高
   inputHeight(e) {
     this.setData({
-      height: Number(e.detail.value) // 确保height是数字
+      height: Number(e.detail.value)
     });
   },
 
-  // 选择性别
   selectGender(e) {
-    const gender = e.currentTarget.dataset.gender;
-    this.setData({ gender });
-  },
-
-  // 重置表单
-  reset() {
     this.setData({
-      age: '',
+      gender: e.currentTarget.dataset.gender
-      height: '',
-      gender: 'male',
-      showResult: false
     });
   },
 
@@ -48,53 +109,45 @@ Page({
     const { age, height, gender } = this.data;
     
     // 输入验证
-    if (!age || !height) {
+    if (!this.validateInput(age, height)) return;
-      wx.showToast({
+
-        title: '请填写完整信息',
+    try {
-        icon: 'none'
+      // 获取标准数据
-      });
+      const standardData = this.getStandardData(age, gender);
-      return;
+      if (!standardData) {
+        throw new Error('未找到对应年龄的标准数据');
       }
 
-    // 直接使用本地生长数据
+      // 计算SDS
-    this.useLocalGrowthData();
+      const sds = this.calculateSDS(
-  },
+        Number(height), 
+        Number(standardData.mean), 
+        Number(standardData.sd)
+      );
       
-  // 处理生长数据
+      // 计算中间值，用于显示
-  processGrowthData(growthData) {
+      const difference = Number(height) - Number(standardData.mean);
-    try {
-      const { age, height, gender } = this.data;
       
-      // 计算SDS值并获取标准数据
+      // 获取评价
-      const { sds, standard } = this.calculateSDS(height, age, gender, growthData);
-      console.log('SDS计算详情：', {
-        height,
-        age,
-        gender,
-        mean: standard.mean,
-        sd: standard.sd,
-        sds
-      });
-      
-      // 显示计算公式
-      console.log(`计算公式：SDS = (${height} - ${standard.mean}) / ${standard.sd} = ${sds.toFixed(2)}`);
-      
-      // 计算百分位数
-      const percentile = this.calculatePercentile(sds);
-      
-      // 获取生长评价
       const evaluation = this.getGrowthEvaluation(sds);
 
-      // 更新结果
+      // 显示结果
       this.setData({
         showResult: true,
-        sdsValue: Number(sds.toFixed(2)), // 确保sdsValue是数字类型
+        sdsValue: Number(sds.toFixed(2)),
-        percentile: percentile,
+        calculationDetails: {
+          height: Number(height).toFixed(1),
+          mean: Number(standardData.mean).toFixed(1),
+          sd: Number(standardData.sd).toFixed(1),
+          formula: `身高SDS = (${height} - ${standardData.mean}) / ${standardData.sd}`,
+          calculation: `         = (${height} - ${standardData.mean}) / ${standardData.sd}`,
+          difference: `         = ${difference.toFixed(1)} / ${standardData.sd}`,
+          result: `         = ${sds.toFixed(2)}`,
+          interpretation: this.getInterpretation(sds)
+        },
         growthEvaluation: evaluation
       });
 
-      // 绘制生长曲线
-      this.drawGrowthChart(growthData);
     } catch (error) {
       wx.showToast({
         title: error.message || '计算失败',
@@ -103,70 +156,118 @@ Page({
     }
   },
 
-  // 使用本地生长数据
+  // 输入验证
-  useLocalGrowthData() {
+  validateInput(age, height) {
-    try {
+    if (!age || !height) {
-      const localData = require('./growthData.js');
-      // 确保数据类型一致
-      const processedData = localData.map(item => ({
-        ...item,
-        age: Number(item.age)
-      }));
-      this.processGrowthData(processedData);
-    } catch (error) {
       wx.showToast({
-        title: '本地数据加载失败',
+        title: '请填写完整信息',
         icon: 'none'
       });
+      return false;
     }
+
+    if (age < 1 || age > 18) {
+      wx.showToast({
+        title: '年龄必须在1-18岁之间',
+        icon: 'none'
+      });
+      return false;
+    }
+
+    if (height <= 0) {
+      wx.showToast({
+        title: '身高必须大于0',
+        icon: 'none'
+      });
+      return false;
+    }
+
+    return true;
+  },
+
+  // 获取标准数据
+  getStandardData(age, gender) {
+    return this.data.standardData[gender].find(item => item.age === age);
   },
 
   // 计算SDS值
-  calculateSDS(height, age, gender, growthData) {
+  calculateSDS(height, mean, sd) {
-    // 根据年龄和性别获取标准值
+    // 输入验证
-    const standard = growthData.find(d => 
+    if (typeof height !== 'number' || typeof mean !== 'number' || typeof sd !== 'number') {
-      Number(d.age) === Number(age) && 
+      throw new Error('输入参数必须为数字');
-      d.gender === gender
-    );
-    
-    if (!standard) {
-      throw new Error('未找到对应年龄和性别的标准数据');
     }
 
-    // SDS = (实际值 - 平均值) / 标准差
+    // SDS = (个体身高 - 平均身高) / 标准差
-    const sds = (height - standard.mean) / standard.sd;
+    const sds = (height - mean) / sd;
-    return { sds, standard };
-  },
     
-  // 计算百分位数
+    // 验证计算结果
-  calculatePercentile(sds) {
+    if (isNaN(sds) || !isFinite(sds)) {
-    // 使用标准正态分布计算百分位数
+      throw new Error('计算结果无效');
-    const percentile = 100 * (1 + math.erf(sds / Math.sqrt(2))) / 2;
+    }
-    return percentile.toFixed(1);
+
+    // 添加计算过程日志
+    console.log('SDS计算过程：', {
+      个体身高: height.toFixed(1),
+      平均身高: mean.toFixed(1),
+      标准差: sd.toFixed(1),
+      计算公式: `(${height.toFixed(1)} - ${mean.toFixed(1)}) / ${sd.toFixed(1)}`,
+      计算结果: sds.toFixed(2)
+    });
+
+    return sds;
   },
 
   // 获取生长评价
   getGrowthEvaluation(sds) {
+    // 根据标准更新评价标准
     if (sds < -2) {
-      return '生长迟缓';
+      return '可能存在生长迟缓';
-    } else if (sds >= -2 && sds <= 2) {
+    } else if (sds > 2) {
-      return '正常范围';
+      return '可能存在生长过快';
     } else {
-      return '生长过快';
+      return '正常范围';
     }
   },
 
-  // 绘制生长曲线
+  // 重置表单
-  drawGrowthChart(growthData) {
+  reset() {
-    const ctx = wx.createCanvasContext('growthChart');
+    this.setData({
-    
+      age: '',
-    // 绘制逻辑...
+      height: '',
-    
+      gender: 'male',
-    ctx.draw();
+      showResult: false,
+      sdsValue: null,
+      calculationDetails: null,
+      growthEvaluation: ''
+    });
   },
 
-  // 返回
+  // 返回上一页
   onClickLeft() {
     wx.navigateBack();
+  },
+
+  // 修改计算百分位数的方法
+  calculatePercentile(sds) {
+    const percentile = normalDistribution.calculatePercentile(sds);
+    return percentile.toFixed(1);
+  },
+
+  // 获取解释文本
+  getInterpretation(sds) {
+    const percentile = this.calculatePercentile(sds);
+    let interpretation = `身高SDS值：${sds.toFixed(2)}\n`;
+    interpretation += `该儿童身高位于同年龄同性别儿童的第${percentile}百分位\n`;
+    
+    // 根据SDS值添加解释
+    if (sds === 0) {
+      interpretation += '身高等于平均值';
+    } else if (sds > 0) {
+      interpretation += `高于平均值${(Math.abs(sds) * 100).toFixed(1)}%`;
+    } else {
+      interpretation += `低于平均值${(Math.abs(sds) * 100).toFixed(1)}%`;
+    }
+    
+    return interpretation;
   }
 });

pages/heightSdsCalculator/heightSdsCalculator.wxml

@@ -61,21 +61,20 @@
   <view class="result-container" wx:if="{{showResult}}">
     <text class="result-title">计算结果</text>
     
-    <view class="result-item">
+    <!-- 计算过程 -->
-      <text class="result-label">身高SDS值</text>
+    <view class="calculation-process">
-      <text class="result-value {{sdsValue >= 0 ? 'green' : 'red'}}">
+      <text class="process-title">计算过程：</text>
-        {{sdsValue.toFixed(2)}}
+      <view class="process-steps">
-      </text>
+        <text>{{calculationDetails.formula}}</text>
+        <text>{{calculationDetails.calculation}}</text>
+        <text>{{calculationDetails.difference}}</text>
+        <text>{{calculationDetails.result}}</text>
+      </view>
     </view>
 
-    <view class="result-item">
+    <!-- 结果解释 -->
-      <text class="result-label">百分位数</text>
+    <view class="result-interpretation">
-      <text class="result-value">{{percentile}}%</text>
+      <text class="interpretation-text">{{calculationDetails.interpretation}}</text>
-    </view>
-
-    <view class="result-item">
-      <text class="result-label">生长评价</text>
-      <text class="result-value">{{growthEvaluation}}</text>
     </view>
 
     <view class="tips">

pages/heightSdsCalculator/heightSdsCalculator.wxss

@@ -133,3 +133,43 @@
   margin-top: 20rpx;
   line-height: 1.6;
 }
+
+.calculation-process {
+  margin: 20rpx 0;
+  padding: 20rpx;
+  background-color: #f8f8f8;
+  border-radius: 10rpx;
+}
+
+.process-title {
+  font-size: 28rpx;
+  color: #333;
+  margin-bottom: 10rpx;
+}
+
+.process-steps {
+  display: flex;
+  flex-direction: column;
+  font-family: monospace;
+  font-size: 28rpx;
+  color: #666;
+}
+
+.process-steps text {
+  margin: 5rpx 0;
+  white-space: pre;
+}
+
+.result-interpretation {
+  margin: 20rpx 0;
+  padding: 20rpx;
+  background-color: #fff;
+  border-radius: 10rpx;
+  border: 1px solid #eee;
+}
+
+.interpretation-text {
+  font-size: 28rpx;
+  color: #333;
+  white-space: pre-line;
+}