Onclick, onclientclick and onserverclick

The following uses HTML buttons (system.web.ui.html controls) and ASP. NET Server buttons (system. Web. UI. webcontrols) as an example:
1. html controls, such as The onclick (client) and onserverclick (server) Events of IMG input buttons. Pay attention to runat = "server "...

Onclick is executed before onserverclick.
2. Web controls, such as <asp: button and other onclientclick (client) and onclick (server) events...

Here, onclientclick is executed before onclick.
The onclientclick event comes from 2.0, which is used to replace the followingCode...

In short, the client click event is executed before the server click event. That is to say, first execute the client's JavaScript and then execute the server's related code on the server side.