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源代码：
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<!DOCTYPE html> <html> <head> <script src="//libs.baidu.com/jquery/1.10.2/jquery.min.js"> </script> <script> $(document).ready(function(){ $(".field").change(function(){ $(this).css("background-color","#D6D6FF"); }); }); </script> </head> <body> <p>Attach a function to run when an element has been changed:</p> Enter your name: <input class="field" type="text"> <p>Write something in the input field, and then press enter or click outside the field.</p> <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> <p>Select an option in the drop-down list.</p> </body> </html>
运行结果
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