第一个办法:
index.htm代码:
<iframe src=1.htm></iframe>
<span id=spanid></span>
1.htm代码:
<select onchange="parent.document.all.spanid.innerText=this.options[this.selectedIndex].value">
<option selected value=1>1</option>
<option value=2>2</option>
</select>
index.htm代码:
<iframe src=1.htm></iframe>
<span id=spanid></span>
1.htm代码:
<select onchange="parent.document.all.spanid.innerText=this.options[this.selectedIndex].value">
<option selected value=1>1</option>
<option value=2>2</option>
</select>
----------
<iframe name=ifrm src=2.htm></iframe>
<input type=button onclick="alert(ifrm.document.form1.s.value)">2.htm
--------
<body>
<form name=form1>
<select name=s>
<option value=1>1
<option value=2>2
<option value=3>3
</select>
</form>
</body>