W3School TIY Editor
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<!DOCTYPE html> <html> <head> <script src="/jquery/jquery-1.11.1.min.js"> </script> <script> $(document).ready(function(){ $("button").on("click",function(){ var version = $().jquery; alert("You are running jQuery version: " + version); }); }); </script> </head> <body> <button>显示版本号</button> </body> </html>