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The jQuery hasClass() method is used to check whether the selected element contains the specified class name. Its usage syntax is "$(selector).hasClass(classname)". The parameter classname indicates that it needs to be searched in the selected element. the type.
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jQuery hasClass() definition and usage
hasClass() method checks whether the selected element contains the specified class name.
If the selected element contains the specified class, this method returns "true".
Syntax
$(selector).hasClass(classname)
Parameters
classname required. Specifies the class to be searched for in the selected elements.
Example
Check whether the
element contains "intro" class:
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>PHP中文网</title> <script src="https://cdn.staticfile.org/jquery/1.10.2/jquery.min.js"> </script> <script> $(document).ready(function(){ $("button").click(function(){ alert($("p").hasClass("intro")); }); }); </script> <style type="text/css"> .intro{ font-size:120%; color:red; } </style> </head> <body> <h1>这是一个段落标题</h1> <p class="intro">这是一个段落</p> <p> 这是另外一个段落</p> <button>是否有 p 元素使用了 "intro" 类?</button> </body> </html>
Running effect:
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