W3School TIY Editor
W3School 在线教程
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<html> <head> <script type="text/javascript" src="/jquery/jquery.js"></script> <script type="text/javascript"> i=0; $(document).ready(function(){ $("input").keypress(function(){ $("span").text(i+=1); }); }); </script> </head> <body> Enter your name: <input type="text" /> <p>Keypresses:<span>0</span></p> </body> </html>