feat: 新增停止大模型回答功能（关联 Issue #104）

web/src/components/ChatComponent.vue

@@ -100,6 +100,10 @@
         >
           请求错误，请重试。{{ message.message }}
         </div>
+        <div v-if="message.isStoppedByUser" class="retry-hint">
+          你停止生成了本次回答 
+          <span class="retry-link" @click="retryStoppedMessage(message)">重新编辑问题</span>
+        </div>
         <RefsComponent v-if="message.role=='received' && message.status=='finished'" :message="message" />
       </div>
     </div>
@@ -153,9 +157,19 @@
             </a-dropdown>
           </div>
           <div class="options__right">
-            <a-button size="large" @click="sendMessage" :disabled="(!conv.inputText && !isStreaming)" type="link">
+            <a-tooltip :title="isStreaming ? '停止回答' : ''">
-              <template #icon> <ArrowUpOutlined v-if="!isStreaming" /> <LoadingOutlined v-else/> </template>
+              <a-button 
+                size="large" 
+                @click="handleSendOrStop" 
+                :disabled="(!conv.inputText && !isStreaming)" 
+                type="link"
+              >
+                <template #icon>
+                  <StopOutlined v-if="isStreaming" />
+                  <ArrowUpOutlined v-else />
+                </template>
               </a-button>
+            </a-tooltip>
           </div>
         </div>
       </div>
@@ -188,6 +202,7 @@ import {
   RobotOutlined,
   CaretRightOutlined,
   DeploymentUnitOutlined,
+  StopOutlined
 } from '@ant-design/icons-vue'
 import { onClickOutside } from '@vueuse/core'
 import { Marked } from 'marked';
@@ -456,6 +471,9 @@ const loadDatabases = () => {
 
 // 新函数用于处理 fetch 请求
 const fetchChatResponse = (user_input, cur_res_id) => {
+  const controller = new AbortController();
+  const signal = controller.signal;
+
   fetch('/api/chat/', {
     method: 'POST',
     body: JSON.stringify({
@@ -466,7 +484,8 @@ const fetchChatResponse = (user_input, cur_res_id) => {
     }),
     headers: {
       'Content-Type': 'application/json'
-    }
+    },
+    signal // 添加 signal 用于中断请求
   })
   .then((response) => {
     if (!response.body) throw new Error("ReadableStream not supported.");
@@ -524,13 +543,24 @@ const fetchChatResponse = (user_input, cur_res_id) => {
     readChunk();
   })
   .catch((error) => {
+    if (error.name === 'AbortError') {
+      console.log('Fetch aborted');
+    } else {
       console.error(error);
       updateMessage({
         id: cur_res_id,
         status: "error",
       });
+    }
     isStreaming.value = false;
   });
+
+  // 监听 isStreaming 变化，当为 false 时中断请求
+  watch(isStreaming, (newValue) => {
+    if (!newValue) {
+      controller.abort();
+    }
+  });
 }
 
 
@@ -607,6 +637,36 @@ watch(
   },
   { deep: true }
 );
+
+// 处理发送或停止
+const handleSendOrStop = () => {
+  if (isStreaming.value) {
+    // 停止生成
+    isStreaming.value = false;
+    const lastMessage = conv.value.messages[conv.value.messages.length - 1];
+    if (lastMessage) {
+      lastMessage.isStoppedByUser = true;
+      lastMessage.status = 'stopped';
+    }
+  } else {
+    // 发送消息
+    sendMessage();
+  }
+}
+
+// 重试被停止的消息
+const retryStoppedMessage = (message) => {
+  // 找到用户的原始问题
+  const messageIndex = conv.value.messages.findIndex(msg => msg.id === message.id);
+  if (messageIndex > 0) {
+    const userMessage = conv.value.messages[messageIndex - 1];
+    if (userMessage && userMessage.role === 'sent') {
+      conv.value.inputText = userMessage.text;
+      // 删除被停止的消息
+      conv.value.messages = conv.value.messages.slice(0, messageIndex);
+    }
+  }
+}
 </script>
 
 <style lang="less" scoped>
@@ -1109,6 +1169,34 @@ watch(
     margin-right: 8px;
   }
 }
+
+.retry-hint {
+  margin-top: 8px;
+  padding: 8px 16px;
+  color: #666;
+  font-size: 14px;
+  text-align: left;
+}
+
+.retry-link {
+  color: #1890ff;
+  cursor: pointer;
+  margin-left: 4px;
+
+  &:hover {
+    text-decoration: underline;
+  }
+}
+
+.ant-btn-icon-only {
+  &:has(.anticon-stop) {
+    background-color: #ff4d4f !important;
+
+    &:hover {
+      background-color: #ff7875 !important;
+    }
+  }
+}
 </style>
 
 <style lang="less">