<!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> <form> <input type="submit" id="t" value="同意（9）" disabled="disabled" /> </form> </body> </html> <script> var n=10; var a=document.getElementById("t"); function bian() { n--; if(n==0) { a.removeAttribute("disabled"); a.value="同意"; return; } else { a.value="同意（"+n+"）"; window.setTimeout("bian()",1000); } } window.setTimeout("bian()",1000); </script>
原文：http://www.cnblogs.com/wangchuanqi/p/5323235.html
