W3Schools 在线编辑工具（TIY） V3.0
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<html> <head> <script type="text/javascript" src="/jquery/jquery.js"></script> <script type="text/javascript"> $(document).ready(function(){ $("p:first").css("background-color","#B2E0FF"); }); </script> </head> <body> <html> <body> <h1>Welcome to My Homepage</h1> <p class="intro">My name is Donald</p> <p>I live in Duckburg</p> <p>My best friend is Mickey</p> <div id="choose"> Who is your favourite: <ul> <li>Goofy</li> <li>Mickey</li> <li>Pluto</li> </ul> </div> </body> </html> </body> </html>