增加键盘按下事件（Enter）

src/App.vue

@@ -32,7 +32,19 @@ export default {
       dialogs: []
     }
   },
+  mounted() {
+    // 增加键盘按下事件
+    document.addEventListener('keydown', this.handleKeyDown)
+  },
+  beforeDestroy() {
+    document.removeEventListener('keydown', this.handleKeyDown)
+  },
   methods: {
+    handleKeyDown(event) {
+      if (event.keyCode === 13) { // keyCode为13表示Enter键
+        this.handleSend()
+      }
+    },
     handleSend() {
       if (this.loading || this.question === '') return;
       this.loading = true;