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.

Recommended: "jquery video tutorial"

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:

<div id="div" class="on">
<span>如果有名为on的class则隐藏这个div</span>
</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.

For more programming-related knowledge, please visit: Programming Teaching! !

The above is the detailed content of How to determine whether jquery class exists. For more information, please follow other related articles on the PHP Chinese website!