chore: use shadow CDN and fix typo

examples/index.tpl

@@ -14,8 +14,8 @@
       }
     </script>
     <div id="app"></div><% if (process.env.NODE_ENV === 'production') { %>
-    <script src="//cdn.jsdelivr.net/npm/vue@2.5.2/dist/vue.runtime.min.js"></script>
-    <script src="//cdn.jsdelivr.net/npm/vue-router@2.7.0/dist/vue-router.min.js"></script><% } %>
+    <script src="//shadow.elemecdn.com/npm/vue@2.5.2/dist/vue.runtime.min.js"></script>
+    <script src="//shadow.elemecdn.com/npm/vue-router@2.7.0/dist/vue-router.min.js"></script><% } %>
   </body>
   <% if (process.env.NODE_ENV === 'production') { %><script>
     (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){

packages/form/src/form.vue

@@ -135,7 +135,7 @@
         props = [].concat(props);
         const fields = this.fields.filter(field => props.indexOf(field.prop) !== -1);
         if (!fields.length) {
-          confirm.warn('[Element Warn]please pass correct props!');
+          console.warn('[Element Warn]please pass correct props!');
           return;
         }