How to determine whether jquery class exists

How to judge whether jquery class exists: first create an html code example; then judge through if judgment and hasClass function, statements such as "if($("#div").hasClass('on') ){$(this).css("display"..)".

The operating environment of this tutorial: Windows 7 system, jquery version 1.10.0. This method is suitable for all brands of computers.

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jquery determines whether a tag has a certain class

if is mainly used here The judgment is made with the hasClass() function. The following is the code:

html code:

 如果有名为on的class则隐藏这个div 

js code:

$(function(){ if($("#div").hasClass('on')){ $(this).css("display","none"); } });

This is often used to add a class to a specific tag, and then Achieve the effect of clicking to hide a div, such as a filter button. After clicking on an option, the entire similar filter box is hidden.

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