change default avatar

@@ -25,7 +25,7 @@ export default {
   },
   computed: {
     imageSrc() {
-      return this.src || '//img10.static.yhbimg.com/headimg/2013/11/28/09/01cae078abe5fe320c88cdf4c220212688.gif??imageView/2/w/{width}/h/{height}';
+      return this.src || '//img11.static.yhbimg.com/yhb-img01/2016/07/05/13/017ec560b82c132ab2fdb22f7cf6f42b83.png?imageView/2/w/{width}/h/{height}';
     }
   }
 };