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分享<form action="#" method="post" id="form1">
<select id="sel">
<option value="">--请选择--</option>
<option value="http://www.baidu.com">百度</option>
<option value="http://www.sina.com">新浪</option>
</select>
</form>
<script>
document.getElementById('sel').onchange =function(){
var value =this[this.selectedIndex].value;
document.getElementById('form1').action = value;
document.getElementById('form1').submit();
};
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<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>
<form action="#" method="post" id="form1">
<select id="sel">
<option value="">--请选择--</option>
<option value="http://www.baidu.com">百度</option>
<option value="http://www.sina.com">新浪</option>
</select>
</form>
<script>
document.getElementById('sel').onchange =function(){
var value =this[this.selectedIndex].value;
document.getElementById('form1').action = value;
document.getElementById('form1').submit();
};
</script>
</body>
</html>