当文本框的值发生改变时，触发事件，在IE中有效

<!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> <title> new document </title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> </head> <body> <input id='txt' value="" /> <input id='btn' value="dsa" type="button" onclick="ff()" /> <script> //当状态改变的时候执行的函数 function handle() { document.getElementById('msg').innerHTML = "输入的文字为：" + document.getElementById('txt').value; } if(/msie/i.test(navigator.userAgent)) //ie浏览器 { document.getElementById('txt').onpropertychange = handle; } else {//非ie浏览器，比如Firefox document.getElementById('txt').addEventListener("input", handle, false); document.getElementById('txt').watch('a', fn); } function ff() { document.getElementById('txt').value=Math.random(); } </script> </body> </html>
[Ctrl+A 全选 注:如需引入外部Js需刷新才能执行]