fix(emergency): 解决消息解析异常问题

- 添加了对消息数据的类型检查
- 添加了JSON解析的异常捕获处理
- 防止非字符串数据导致的解析错误
- 确保消息处理的健壮性

src/views/emergency/helper/index.vue

@@ -172,7 +172,13 @@
         loadingVisible.value = false;
     };
     window.onmessage = async (msg) => {
-        const result = JSON.parse(msg.data);
+        if (!msg.data || typeof msg.data !== 'string') return;
+        let result: any;
+        try {
+            result = JSON.parse(msg.data);
+        } catch (e) {
+            return;
+        }
         switch (result.code) {
             case 'closeLoading':
                 closeLoading();