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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>
<body>
<select id="sel">
</select>
<script>
var sel = document.getElementById('sel');
var returnvalue = window.showModalDialog('b.html',sel);
if(returnvalue){
var option = document.createElement('option');
option.innerHTML = returnvalue;
sel.appendChild(option)
}
</script>
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>
<body>
bbbbbbbbbbbbbbb
<input type="button" value="click me" onclick="aa()" />
<script>
function aa(){
var sel = window.dialogArguments;
var option = 'aaaa'
window.returnValue = option;
window.close();
}
</script>
</body>
</html>
window.opener.aSel.options[aSel.option.length]=new Option(.. //这样呢?
var option = document.createElement('input');
option.value = 'value';
option.innerHTML = 'html';
aSel.appendChild(option);