How do I change function after clicking buttons in JavaScript? -

if have 3 functions a(),b(),c()

<input type="button" value="text"  id="button" onclick="a()"></input>

what should write in function a() make into

<input type="button" value="text"  id="button" onclick="b()"></input>

after click button.

change attribute after click:

<input type="button" value="text"  id="button" onclick="b();this.setattribute('onclick','a()')"></input>

Brande