function CheckLogin(){ if (document.Login.Username.value==""){ alert("用户名不能为空!"); document.Login.Username.focus(); } else if (document.Login.Password.value==""){ alert("密码不能为空!"); document.Login.Password.focus(); } else { return true; } return false; } document.write(''); document.write(''); document.write(''); document.write(''); document.write(''); document.write(''); document.write(''); document.write(''); document.write('
'); document.write('用户名:'); document.write(' 密码:'); document.write(' 
');