小程序聊天修正

urbanLifelineWeb/packages/workcase_wechat/api/ai/aiChat.ts

@@ -22,6 +22,51 @@ declare const uni: {
     request: (options: any) => any
 }
 
+/**
+ * ArrayBuffer 转字符串（兼容微信小程序真机环境）
+ * 微信小程序真机不支持 TextDecoder，需要手动解码 UTF-8
+ */
+function arrayBufferToString(buffer: ArrayBuffer): string {
+    // 优先使用 TextDecoder（开发者工具和支持的环境）
+    if (typeof TextDecoder !== 'undefined') {
+        return new TextDecoder('utf-8').decode(new Uint8Array(buffer))
+    }
+    
+    // 微信小程序真机兼容方案：手动解码 UTF-8
+    const bytes = new Uint8Array(buffer)
+    let result = ''
+    let i = 0
+    
+    while (i < bytes.length) {
+        const byte1 = bytes[i++]
+        
+        if (byte1 < 0x80) {
+            // 单字节字符 (0xxxxxxx)
+            result += String.fromCharCode(byte1)
+        } else if ((byte1 & 0xE0) === 0xC0) {
+            // 双字节字符 (110xxxxx 10xxxxxx)
+            const byte2 = bytes[i++] & 0x3F
+            result += String.fromCharCode(((byte1 & 0x1F) << 6) | byte2)
+        } else if ((byte1 & 0xF0) === 0xE0) {
+            // 三字节字符 (1110xxxx 10xxxxxx 10xxxxxx) - 中文常用
+            const byte2 = bytes[i++] & 0x3F
+            const byte3 = bytes[i++] & 0x3F
+            result += String.fromCharCode(((byte1 & 0x0F) << 12) | (byte2 << 6) | byte3)
+        } else if ((byte1 & 0xF8) === 0xF0) {
+            // 四字节字符 (11110xxx 10xxxxxx 10xxxxxx 10xxxxxx) - emoji等
+            const byte2 = bytes[i++] & 0x3F
+            const byte3 = bytes[i++] & 0x3F
+            const byte4 = bytes[i++] & 0x3F
+            const codePoint = ((byte1 & 0x07) << 18) | (byte2 << 12) | (byte3 << 6) | byte4
+            // 转换为 UTF-16 代理对
+            const surrogate = codePoint - 0x10000
+            result += String.fromCharCode(0xD800 + (surrogate >> 10), 0xDC00 + (surrogate & 0x3FF))
+        }
+    }
+    
+    return result
+}
+
 /**
  * @description    AI对话相关接口（直接调用ai模块）
  * @filename    aiChat.ts
@@ -128,8 +173,8 @@ export const aiChatAPI = {
         // 监听分块数据
         requestTask.onChunkReceived((res: any) => {
             try {
-                const decoder = new TextDecoder('utf-8')
-                const text = decoder.decode(new Uint8Array(res.data))
+                // 兼容微信小程序真机环境（不支持 TextDecoder）
+                const text = arrayBufferToString(res.data)
 
                 const lines = text.split('\n')
                 for (const line of lines) {