//发送邮箱,激活账号
public function actionEmail()
{
    $email=Yii::$app->request->get('email');
    //数字签名
    $em_1=md5($email);
    //邮箱发送
    $mail= Yii::$app->mailer->compose();
    $mail->setTo($email);
    $mail->setSubject("激活邮箱");
    //发布可以带html标签的文本
    $mail->setHtmlBody("<a href='http://www.small2.com/backend/web/index.php?r=login/live&em_1=".$em_1."&email=".$email."'>点击此链接</a>");
    if($mail->send())
      echo "success";
    else
      echo "false";
    die(); //邮箱发送ok
}
//激活账号
public function actionLive()
{
   $email=Yii::$app->request->get('email');
   $em_1=Yii::$app->request->get('em_1');
   //echo $em_1;die;
   $em_2=md5($email);
   //echo $em_2;die;
   if($em_1==$em_2)
   {
     $res=Yii::$app->db;
     $data=$res->createCommand()->update("login",["status"=>1],["email"=>$email])->execute();
     if($data)
     {
      echo "<script>alert('激活成功，可登录');location.href='index.php?r=login/login'</script>";
     }
     else
     {
       echo "<script>alert('激活失败');location.href='index.php?r=login/login'</script>";
     }
   }
   else
   {
     echo "<script>alert('参数错误,重新激活');location.href='index.php?r=login/login'</script>";
   }
}