解决跨越问题

router/lesson.js

@@ -14,18 +14,19 @@ var fileHelper = require("../helper/LjFileHelper");
 var apiHelper = require("../helper/LjApiHelper");
 var ljStringHelper = require("../helper/LjStringHelper");
 
-
 /**
  * 获取MAC地址
  */
 router.get("/getMac", function (req, res)
 {
-    var aa = apiHelper.getApiForGetMac();
+    var mac = apiHelper.getApiForGetMac();
     ljRetState.code = 200;
-    ljRetState.data = aa;
+    ljRetState.data = mac;
     ljRetState.success = true;
     logHelper.info(aa);
+    res.setHeader("Access-Control-Allow-Origin", "*");
     res.json(ljRetState);
+
     return;
 });