<ul id="parent-list">
<li id="post-1">Item 1</li>
<li id="post-2">Item 2</li>
<li id="post-3">Item 3</li>
<li id="post-4">Item 4</li>
<li id="post-5">Item 5</li>
<li id="post-6">Item 6</li>
</ul>

// 找到父元素，添加監聽器...
document.getElementById("parent-list").addEventListener("click",function(e) {
// e.target是被點擊的元素!
// 如果被點擊的是li元素
if(e.target && e.target.nodeName == "LI") {
// 找到目標，輸出ID!
console.log("List item ",e.target.id.replace("post-")," was clicked!");
}
});

// 獲得父元素DIV, 添加監聽器...
document.getElementById("myDiv").addEventListener("click",function(e) {
// e.target是被點擊的元素
if(e.target && e.target.nodeName == "A") {
// 獲得CSS類名
var classes = e.target.className.split(" ");
// 搜索匹配!
if(classes) {
// For every CSS class the element has...
for(var x = 0; x < classes.length; x++) {
// If it has the CSS class we want...
if(classes[x] == "classA") {
// Bingo!
console.log("Anchor element clicked!");

// Now do something here....

}
}
}

}
});