function onSubmitFrom(form){ with(from){ if(TrimA(username).length==0){ showMSG('用户名'); return false; } if(TrimA(password).length==0){ showMSG('密码'); return false; } if(TrimA(valiCode).length==0){ showMSG('验证码'); return false; } } return true; function showMSG(ms...