(function(ul) {
    arr.forEach(function(text) {
        setupItem(ul.appendChild(document.createElement("li")), text);
    })
})(document.appendChild(document.createElement("ul")));

function setupItem(li, text) {
    li.textContent = text;
    li.addEventListener("click", onClick, false);
}

function onClick() {
    alert(this.textContent);
}