是可能的.

1. 首先在解析管理控制台中启用客户端推送

1. First enable client push in your parse admin console

使用ParsePush类，我们可以选择设置ParseInstallation查询，其中通知将针对特定的用户集，

Using ParsePush class, we have an option to set the ParseInstallation Query, where the notifications would be targeted to specific set of users,

https://parse.com/docs/push_guide#options-data/iOS

但是您可能无法发送给特定用户，因为ParseInstallation表没有这样的列以使其不受查询约束.

But you may NOT be able to send to a specific user, since the ParseInstallation table doesnt have such column to have it in query constraint.

因此，我在ParseInstallation表中添加了新字段'用户名'，并在用户登录时更新了用户名.

So I added a new field 'username' in ParseInstallation table, and update the username whenever the user log in.

然后在发送推送时，根据此用户名创建ParseInstallation查询，以下示例适用于android，与其他操作系统类似

Then while sending the push, create the ParseInstallation query based on this username, the below example is for android, and it would be similar for other OS

 JSONObject data = new JSONObject();
    try {
        data.put("action", "com.bt.yana.GOT_MESSAGE");
        data.put("from", ParseUser.getCurrentUser().getUsername());
    }catch (Exception e){
        e.printStackTrace();
        return;
    }


    ParsePush parsePush = new ParsePush();
    parsePush.setData(data);

    ParseQuery<ParseInstallation> parseQuery = ParseQuery.getQuery(ParseInstallation.class);
    if(toUser!=null) {
        parseQuery.whereEqualTo("username", toUser);
        parsePush.setQuery(parseQuery);
        parsePush.sendInBackground();
    }