How does the javascript-google map api call its ranging function?

For example, on the official website, he is bound to the right-click interface. In the Google map Developer Center, I did not see this call (that is, it is neither a service nor a library ...), so who knows how to call it.

For example, on the official website, he is bound to the right-click interface. In the Google map Developer Center, I did not see this call (that is, it is neither a service nor a library ...), so who knows how to call it.

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For example, on the official website, he is bound to the right-click interface. In the Google map Developer Center, I did not see this call (that is, it is neither a service nor a library ...), so who knows how to call it.

The wall is too high, and the ladder is not powerful, so it cannot help you :-(
I personally feel that Baidu map's api can be used in the wall to meet most of the requirements.