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<html>
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<head>
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<script src="https://code.jquery.com/jquery-3.3.1.min.js"></script>
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<script type="text/javascript">
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$(document).ready(function(){
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$(".field").change(function(){
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$(this).css("background-color","#FFFFCC");
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});
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});
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</script>
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</head>
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<body>
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<p>在某个域被使用或改变时，它会改变颜色。</p>
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Enter your name: <input class="field" type="text" />
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<p>Car:
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<select class="field" name="cars">
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<option value="volvo">Volvo</option>
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<option value="saab">Saab</option>
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<option value="fiat">Fiat</option>
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<option value="audi">Audi</option>
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</select>
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</p>
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</body>
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</html>
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