修改配色，修改功能

codes/minipro/calculation/miniprogram/pages/calculator/calculator.ts

@@ -8,9 +8,27 @@ Page({
     waitingForSecondOperand: false,
     isScientific: false,
     showHistory: false,
+    showHelp: false,
     historyList: [] as Array<{expression: string, result: string}>
   },
 
+  onShareAppMessage() {
+    return {
+      title: '便捷好用的科学计算器',
+      path: '/pages/calculator/calculator'
+    }
+  },
+
+  onShareTimeline() {
+    return {
+      title: '便捷好用的科学计算器'
+    }
+  },
+
+  toggleHelp() {
+    this.setData({ showHelp: !this.data.showHelp });
+  },
+
   onLoad() {
     // 从本地存储恢复历史记录
     const saved = wx.getStorageSync('CALC_HISTORY');
@@ -34,6 +52,15 @@ Page({
       });
   },
 
+  switchMode(e: any) {
+      const mode = e.currentTarget.dataset.mode;
+      const isSci = (mode === 'scientific');
+      if (this.data.isScientific !== isSci) {
+          this.vibrate();
+          this.setData({ isScientific: isSci });
+      }
+  },
+
   onDigit(e: any) {
     this.vibrate();
     const digit = e.currentTarget.dataset.digit;