a.htm
<form name="form1" method="post" action="">
<p>
<textarea name="textarea"></textarea>
</p>
<p> </p>
</form>
<iframe src="b.htm" width="450" height="200" scrolling="yes" align="center" frameborder="0"></iframe>b.htm
<script language="JavaScript" type="text/JavaScript">
<!--
function MM_jumpMenu(){ //v3.0
parent.parent.document.form1.textarea.value = document.form1.menu1.options[document.form1.menu1.selectedIndex].value;
}
//-->
</script>
<form name="form1">
<p>
<select name="menu1" onChange="MM_jumpMenu()">
<option value="abcdefg">abcdefg</option>
<option value="1234567">1234567</option>
<option value="你好你好">你好你好</option>
</select>
</p>
</form>两个文件放在一个文件夹下,然后用ie打开a.htm
<form name="form1" method="post" action="">
<p>
<textarea name="textarea"></textarea>
</p>
<p> </p>
</form>
<iframe src="b.htm" width="450" height="200" scrolling="yes" align="center" frameborder="0"></iframe>b.htm
<script language="JavaScript" type="text/JavaScript">
<!--
function MM_jumpMenu(){ //v3.0
parent.parent.document.form1.textarea.value = document.form1.menu1.options[document.form1.menu1.selectedIndex].value;
}
//-->
</script>
<form name="form1">
<p>
<select name="menu1" onChange="MM_jumpMenu()">
<option value="abcdefg">abcdefg</option>
<option value="1234567">1234567</option>
<option value="你好你好">你好你好</option>
</select>
</p>
</form>两个文件放在一个文件夹下,然后用ie打开a.htm
<input type="text" id="MyText">b.htm<select onchange="parent.document.getElementById('MyText').value = options[selectedIndex].text;">
<option>aaaa</option>
<option>bbbb</option>
<option>cccc</option>
<option>dddd</option>
<option>eeee</option>
</select>