Update component-basics.md (#654)

Author: ro-n

src/guide/component-basics.md

@@ -176,7 +176,7 @@ Which can be used in the template to control the font size of all blog posts:
 ```html
 <div id="blog-posts-events-demo">
   <div v-bind:style="{ fontSize: postFontSize + 'em' }">
-    <blog-post v-for="post in posts" :key="post.id" :title="title"></blog-post>
+    <blog-post v-for="post in posts" :key="post.id" :title="post.title"></blog-post>
   </div>
 </div>
 ```