能改变input的type属性吗
例如把button换成submit

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应该不可以，无法获取type属性 js
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删了重建一个
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可以用这种方法(在IE,FireFox下通过)
<form name= "form1 " method= "post " action= "reg.asp ">
姓名：
<input type= "text " name= "name ">
<input type= "button " name= "test " value= "测试 " onclick= "change() "/>
<div id= "temp "> <input type= "button " name= "temp " value= "用来改变 " /> </div>
</form>
<script type= "text/javascript ">
function change()
{
var temp=document.getElementById( "temp ");
alert( "文本： "+temp.innerHTML);
temp.innerHTML= " <input type=\ "submit\ " value=\ "改变后的\ " /> "
}
</script>