javascript - How to get alert message on second click of a button -

i know how can alert message on second click of button, not on first click.

ex: <input type="button" value="message" onclick="showmessage()">

function showmessage(){     alert("it's second click message"); // alert message should shown on second click of button } 

use counter instead..

var count = 0; //global variable  function showmessage() {    if (count++ == 1) { //compare , increment counter      alert("it's second click message"); //this alert message shown on second click of button    }  }

<input type="button" value="message" onclick="showmessage()">