How to determine whether an element has scroll bars in jquery

Judgment method: First use the "$("body").scrollTop(10)" statement to control the scroll bar scrolling, and then use "if( $("body").scrollTop()>0)" The statement determines whether the scroll bar is offset; if there is an offset, the scroll bar exists. On the contrary, it does not exist without scrolling.

The operating environment of this tutorial: windows7 system, jquery3.2.1 version, Dell G3 computer.

How jquery determines whether an element has a scroll bar:

Use jQuery to control the scroll bar scrolling, and then determine whether the scroll bar is offset. If there is, the scroll bar exists, otherwise it does not exist without scrolling.

Related learning recommendations: javascript video tutorial

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