detect if I left click javascript code example

Example 1: javascript detect right click

el.addEventListener('contextmenu', function(ev) {
    ev.preventDefault();
    alert('success!');
    return false;
}, false);

Example 2: javascript detect right click

document.body.onclick = function (e) {
    var isRightMB;
    e = e || window.event;

    if ("which" in e)  // Gecko (Firefox), WebKit (Safari/Chrome) & Opera
        isRightMB = e.which == 3; 
    else if ("button" in e)  // IE, Opera 
        isRightMB = e.button == 2; 

    alert("Right mouse button " + (isRightMB ? "" : " was not") + "clicked!");
}