Courses automatically refresh pages when there are no web pages to the bottom

Thank you. The younger brother just got started. The code is not very understandable. It is best to have code for all instances. It is better to have video courses. Thank you. The younger brother just got started. The code is not very understandable. It is best to have code for all instances. It is better to have video courses. Thank you.

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Thank you. The younger brother just got started. The code is not very understandable. It is best to have code for all instances. It is better to have video courses. Thank you.

MOOC class.
Waterfall flow Layout

1. Listen to the scroll bar for judgment

The height of the scroll bar + the height of the current page and the height of the whole body

1. At the bottom of the page, the AJAX request is used to render the DOM.

Keywords: waterfall stream (a little more complex than what you said)