<select name="genre" id="genre" >
<option value="PCB" style="background-color:#FfEEFF;color:green;font-weight: bold"> P C B </option>
<option value="IC" style="background-color:#EEFFFf;color:red;font-weight: bold"> I C </option>
</select><input name="plan" type="text" id="plan" size="15" maxlength="30" value="?">
如何让我选择列表/菜单中的PCB时,plan文本框中出现有PCS,选择列表/菜单中的IC时,出现EA
<option value="PCB" style="background-color:#FfEEFF;color:green;font-weight: bold"> P C B </option>
<option value="IC" style="background-color:#EEFFFf;color:red;font-weight: bold"> I C </option>
</select><input name="plan" type="text" id="plan" size="15" maxlength="30" value="?">
如何让我选择列表/菜单中的PCB时,plan文本框中出现有PCS,选择列表/菜单中的IC时,出现EA
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<SCRIPT LANGUAGE="JavaScript">
function genrefun()
{
if (document.getElementById("genre").value == "PCB")
document.getElementById("plan").value = "PCS";
else if (document.getElementById("genre").value == "IC")
document.getElementById("plan").value = "EA";
}</SCRIPT>
</head><body>
<form id="form1" name="form1" method="post" action="">
<select name="genre" id="genre" onchange="genrefun()">
<option value="PCB" style="background-color:#FfEEFF;color:green;font-weight: bold"> P C B </option>
<option value="IC" style="background-color:#EEFFFf;color:red;font-weight: bold"> I C </option>
</select><input name="plan" type="text" id="plan" size="15" maxlength="30" value="PCS">
</form>
</body>
</html>