Steps to reproduce

According to the Chinese doc (see at https://cn.vuejs.org/v2/guide/events.html)

1. Copy the example code（example-2） to my test page
2. In the console, enter example2.greet() , click Enter; it will show a dialog box, click Enter
3. U will see an error in console.

And the example in English doc is OK. At last, I found they are different:

Chinese:

English:

What is expected?

PS: I think this create issues page is not friendly:

1. I can not use markdown language
2. I can not paste an image to describe the problem in a better detail

What is actually happening?