<!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>
<script type="text/javascript">
function ChangeInputType(inputType){
var oldControl = document.getElementById("testControl"); var controlParent = oldControl.parentNode; var newControl = document.createElement("input"); newControl.setAttribute("type",inputType); controlParent.appendChild(newControl); controlParent.removeChild(oldControl);
}</script></head><body> <input type="button" value="changeType" onclick="ChangeInputType('file');" /> <div> <input type="text" id="testControl" /> </div></div></body></html>