var eleArr = document.getElementById("test-list").children;
var wordsArr=[];
for (var i = 0; i < eleArr.length; i++) {
    wordsArr[wordsArr.length]=eleArr[i].innerHTML;
}

wordsArr.sort();

for (var i = 0; i < eleArr.length; i++) {
    eleArr[i].innerHTML = wordsArr[i];
}