Truy vấn theo Class 1
RUN
<!DOCTYPE html> <html> <head> <title>Add Class jQuery</title> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <script language="javascript" src="https://code.jquery.com/jquery-2.0.0.min.js"></script> <script language="javascript"> function clickEvent() { var element = $('.container'); alert(element.length); } </script> </head> <body> <div class="container"> Container1 </div> <div class="container"> Container2 </div> <div class="container"> Container3 </div> <div class="container"> Container4 </div> <input type="button" value="Click Me" onclick="clickEvent()"/> </body> </html>
PHÓNG TO