charset=utf-8" /> <title>无标题文档</title> <script type="application/javascript"> //setTimeout("window.location=‘http://www.baidu.com‘",3000); //setInterval("alert(‘周期执行‘)",2000); window.history.go(1); function jianc() { //var t =document.getElementById(‘tid1‘); var t = form1.tid1; //var t = form1.tname1; //var t = form2.tid1; //var t = form2.tname1; if(t.value ==‘‘) { alert(‘请输入用户代码‘); return false; } var p =document.getElementsByName(‘tname2‘); //var p =document.getElementsByName(‘tname2‘)[0]; var a =p[0]; //if(p.value == ‘‘) if(a.value == ‘‘) { alert(‘请输入用户密码‘); return false; } return true; } </script> </head> <body> <form id="form1" name="form2" method="get" onSubmit="return jianc();" > 用户代码：<input id="tid1" name="tname1" value="" type="text" width="30"/><br><br> 用户密码：<input id="tid2" name="tname2" type="password" width="30"/><br> <br> <input type="submit" value="登录" /> </form> <input type="button" value="跳转" onClick="window.history.go(-1);"/> </body> </html>
原文：http://www.cnblogs.com/ymf123/p/4967727.html