Determine which ASP.NET button was clicked using Javascript

Question

What is the best way to determine which ASP.NET button was clicked on a single page using JavaScript?

Answer 1

Add a client-side onclick handler to each button pointing to the same function?

e.g.

<button onclick="myHandler(this.ID)" />

Answer 2

I just the set the OnClientClick event handler for the button with the JavaScript function I wanted executed when the button was clicked during the Page_Load event.

protected void Page_Load(object sender, EventsArgs e)
{
    MyButton.OnClientClick = "MyJavaScriptMethod();";
}