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<html> <head> <script type="text/javascript" src="/jquery/jquery.js"></script> <script type="text/javascript"> $(document).ready(function(){ $(".field").change(function(){ $(this).css("background-color","#FFFFCC"); }); }); </script> </head> <body> <p>在某个域被使用或改变时,它会改变颜色。</p> Enter your name: <input class="field" type="text" /> <p>Car: <select class="field" name="cars"> <option value="volvo">Volvo</option> <option value="saab">Saab</option> <option value="fiat">Fiat</option> <option value="audi">Audi</option> </select> </p> </body> </html>