Push message realizes dynamic display of icon's corner mark

On your own server to do the count, the client does subtraction and feedback to your server, and then your server will need to display the number sent to the Apple Push Server (badge in the message)
For example: 1, your server sent out 3 push messages to a mobile phone
2, at this time a mobile phone does not open the application (that is, there is no subtraction operation), then send a push to a again on the basis of 3 to do the cumulative
OR: When mobile phone A has been opened, read 1 push (feedback to the server), the server does minus 1 operations, push again on the (3-1) version and add 1 operation
3, as long as you send the number >0, the application icon on the upper right corner can display the number. (Badge=5, display is 5, whether your application is open or closed)

Push message realizes dynamic display of icon's corner mark