<!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" /> <meta name="author" content="" /> <meta name="keywords" content="" /> <meta name="description" content="" /> <link rel="stylesheet" type="text/css" href="" /> <style type="text/css"> .login{width:40px;height:25px;line-height:25px;background-color:#4E74A5;margin-top:30px;text-align:center;color:#FFF;} </style> <script type="text/javascript" src="jquery-1.7.1.min.js"></script> </head> <body> <input type="text" class="pass" value="" /> <div id="enter" class="login" onclick="enter_login();"> 登录</div> <script type="text/javascript"> function enter_login(){ var pwd = $(".pass").val(); if(pwd==""){ alert(1); }else{ alert(2); } } document.onkeydown = function (e) { if (!e) e = window.event; if ((e.keyCode || e.which) == 13) { $(".login").click(); } } </script> </body> </html>
2.
<!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" /> <meta name="author" content="" /> <meta name="keywords" content="" /> <meta name="description" content="" /> <link rel="stylesheet" type="text/css" href="" /> <style type="text/css"> .login{width:40px;height:25px;line-height:25px;background-color:#4E74A5;margin-top:30px;text-align:center;color:#FFF;} </style> <script type="text/javascript" src="jquery-1.7.1.min.js"></script> </head> <body onkeydown="keyLogin(event);"> <input type="text" class="pass" value="" /> <div id="enter" class="login" onclick="enter_login();"> 登录</div> <script type="text/javascript"> function enter_login(){ var pwd = $(".pass").val(); if(pwd==""){ alert(1); }else{ alert(2); } } function keyLogin(event){ if (event.keyCode==13){ document.getElementById("enter").click(); } } </script> </body> </html>