is clicked js code example

Example 1: how to detect a button click in javascript

if(document.getElementById('button').clicked == true)
{
   alert("button was clicked");
}

Example 2: element clicked js

document.addEventListener('click', function(e) {
    e = e || window.event;
    var target = e.target || e.srcElement,
        text = target.textContent || target.innerText;   
}, false);