fix small typo in the vueJS example
diff --git a/source/references/js-service.md b/source/references/js-service.md
index 116a3ef..e7e0037 100644
--- a/source/references/js-service.md
+++ b/source/references/js-service.md
@@ -107,7 +107,7 @@
 var _NormalService = new service.normalService(weex)
 
 module.exports = {
-  created: fucntion() {
+  created: function() {
     // called modal module to toast something
     _InstanceService.toast('Instance JS Service')
     _NormalService.toast('Normal JS Service')