improve makeServerUrl to eliminate ':port' when port is empty

unitool.js

@@ -151,24 +151,11 @@ export default {
       return route
     }
 
-    let hostname = envar.servHostname
-    let port = envar.servPort
-    // #ifdef H5
-    if (!hostname) {
-      hostname = window?.location?.hostname
-    }
-    if (!port) {
-      port = window?.location?.port?.replace(':', '')
-    }
-    // #endif
-    if (!hostname) {
-      // 如果没有配置 envar.servHostname，又不是在 H5 环境，则最后的默认值是 localhost
-      hostname = 'localhost'
-    }
-
+    const hostname = envar.servHostname || globalThis.window?.location?.hostname || 'localhost'
+    const port = envar.servPort || globalThis.window?.location?.port || ''
     const protocol = hostname === 'localhost' ? 'http' : envar.servProtocol || (process.env.NODE_ENV === 'production' ? 'https' : 'http')
 
-    return `${protocol}://${hostname}:${port}/${route.replace(/^\//, '')}`
+    return `${protocol}://${hostname}${port ? ':' : ''}${port}/${route.replace(/^\//, '')}`
   },
 
   makeBgUrl (path) {