fix: 修复connection.effectiveType可能为undefined情况代码报错

src/platforms/h5/service/api/device/network-info.js

@@ -33,8 +33,10 @@ export function getNetworkType () {
   let networkType = 'unknown'
   if (connection) {
     networkType = connection.type
-    if (networkType === 'cellular') {
-      networkType = connection.effectiveType.replace('slow-', '')
+    if (networkType === 'cellular') {
+      if (connection.effectiveType) {        
+        networkType = connection.effectiveType.replace("slow-", "");      
+      }
     } else if (!['none', 'wifi'].includes(networkType)) {
       networkType = 'unknown'
     }