jquery easy ui:http://www.runoob.com/jeasyui/jeasyui-dd-shopping.html
<html> <head> <title>dynamic show</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> </head> <body onload=highlight(\'haha\')> <script> function highlight(obj){ var selected = document.getElementById("currency"); document.getElementById("spantest").innerHTML=selected.options[selected.selectedIndex].text; document.getElementById("ptest").style.fontSize="xx-large"; document.getElementById("ptest").style.color="red"; } </script> <tr id="trtest"> <td colspan=3 id="tdtest" name="tdtest" > <select id="currency" name="currency" onchange="highlight(\'haha\')"> <option id="op1" value="one">1</option> <option id="op2" value="two">2</option> </select> <span id="spantest" style="color:red; font-size:xx-large"></span> <!--p id="ptest">This is an example paragraph.</p--> </td> <tr> </body> </html>