javascript add custom click event

function addEvent(elem, event, func) {

    if (elem.addEventListener) {

        elem.addEventListener(event, func, false);

    } else if (elem.attachEvent) {

        elem.attachEvent('on' + event, func);

    } else {

        elem['on' + event] = func;

    }

}



function customFunc() {

    alert('custom Function');

}



var target = document.getElementById('target');

addEvent(target, 'click', customFunc);



var target2 = document.querySelector('.target2');

addEvent(target2, 'click', customFunc);

html:

<p id="target">target element - click on me to see event</p>

<p class="target2">target2 element - click on me to see event</p>