Feat: 增加计算 BMI 页面

entry/src/main/ets/pages/BMI.ets

@@ -0,0 +1,99 @@
+// BMI计算页面组件
+@Entry
+@Component
+struct BMIPage {
+  @State humanWeight: string = ''
+  @State humanHeight: string = ''
+  @State bmiValue: number = 0
+  @State healthAssessment: string = ''
+  @State showError: boolean = false
+
+  // 计算BMI
+  calculateBMI() {
+    // 输入验证
+    if (!this.humanWeight || !this.humanHeight ||
+    isNaN(Number(this.humanWeight)) ||
+    isNaN(Number(this.humanHeight))) {
+      this.showError = true
+      return
+    }
+
+    this.showError = false
+    const humanWeightNum = parseFloat(this.humanWeight)
+    const humanHeightNum = parseFloat(this.humanHeight) / 100.0
+    this.bmiValue = humanWeightNum / (humanHeightNum * humanHeightNum)
+
+    // 健康评估逻辑
+    if (this.bmiValue < 18.5) {
+      this.healthAssessment = "偏瘦 | 建议增加体重"
+    } else if (this.bmiValue < 24.9) {
+      this.healthAssessment = "正常 | 保持良好的生活习惯"
+    } else if (this.bmiValue < 29.9) {
+      this.healthAssessment = "偏胖 | 建议减少体重"
+    } else {
+      this.healthAssessment = "肥胖 | 建议就医咨询"
+    }
+  }
+
+  build() {
+    Column() {
+      // 输入区域
+      Column({ space: 20 }) {
+        // 体重输入
+        Row() {
+          Text('体重（公斤）').width(100)
+          TextInput({ text: this.humanWeight })
+            .width('60%')
+            .type(InputType.Number)
+            .onChange((value: string) => {
+              this.humanWeight = value
+            })
+        }
+
+        // 身高输入
+        Row() {
+          Text('身高（厘米）').width(100)
+          TextInput({ text: this.humanHeight })
+            .width('60%')
+            .type(InputType.Number)
+            .onChange((value: string) => {
+              this.humanHeight = value
+            })
+        }
+      }.padding(20)
+
+      // 错误提示
+      if (this.showError) {
+        Text('请输入有效的数字')
+          .fontColor(Color.Red)
+          .margin({ bottom: 10 })
+      }
+
+      // 计算按钮
+      Button('计算BMI')
+        .width('80%')
+        .height(50)
+        .onClick(() => {
+          this.calculateBMI()
+        })
+
+      // 结果展示
+      if (this.bmiValue > 0 && !this.showError) {
+        Column() {
+          Text(`BMI值: ${this.bmiValue.toFixed(1)}`)
+            .fontSize(20)
+            .margin({ bottom: 10 })
+          Text(this.healthAssessment)
+            .fontColor('#666')
+        }
+        .width('90%')
+        .padding(20)
+        .backgroundColor('#f5f5f5')
+        .borderRadius(8)
+        .margin({ top: 20 })
+      }
+    }
+    .width('100%')
+    .padding(20)
+  }
+}

entry/src/main/ets/pages/Index.ets

@@ -37,6 +37,16 @@ struct Index {
       .height('100%')
       .justifyContent(FlexAlign.End)
       .alignItems(HorizontalAlign.Center)
+      .onClick(() => {
+        console.log("用户操作：点击按钮")
+        let uiContext: UIContext = this.getUIContext();
+        let router = uiContext.getRouter();
+        router.pushUrl({
+          url: 'pages/BMI'
+        }).then(() => {
+          console.log('系统提示：跳转成功')
+        })
+      })
     }
     .width('100%')
     .height('100%')

entry/src/main/resources/base/profile/main_pages.json

@@ -1,6 +1,7 @@
 {
   "src" : [ "pages/Index",
     "pages/Hello",
-    "pages/Text"
+    "pages/Text",
+    "pages/BMI"
   ]
 }