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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>本教程(w3big.com)</title> <script src="http://cdn.static.w3big.com/libs/jquery/1.10.2/jquery.min.js"> </script> <script> $(document).ready(function(){ $(".field").change(function(){ $(this).css("background-color","#D6D6FF"); }); }); </script> </head> <body> <p>元素改变后执行一个函数:</p> 输入你的名字: <input class="field" type="text"> <p>在输入框中写一些东西,按下 enter 键或点击输入框外的区域。</p> <p>汽车匹配: <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>在下拉列表选择一个选项。</p> </body> </html>