原生js怎么绑定a连接点击事件

原生js如何绑定a连接点击事件？
原生js如何绑定a连接点击事件？


------解决方案--------------------
错了，应该是
使用事件委托
var EventUtil = {

addHandler: function(element, type, handler) {
if (element.addEventListener) {
element.addEventListener(type, handler, false);
} else if (element.attachEvent) {
element.attachEvent("on", + type, handler);
} else {
element["on" + type] = handler;
} 
},

getEvent: function(event) {
return event ? window.event;
},

getTarget: function(event) {
return event.target || event.srcElement;
},

preventDefault: function(event) {
if (event.preventDefault) {
event.preventDefault();
} else {
event.returnValue = false;
}
},

removeHandler: function(element, type, handler) {
if (element.removeEventListener) {
element.removeEventListener(type, handler, false);
} else if (element.detachEvent) {
element.detachEvent("on", + type, handler);
} else {
element["on" + type] = null;
} 
}
};

var list = document.getElementById("switch_sites");

EventUtil.addHandler(list, "click", function(event){
event = EventUtil.getEvent(event);
var target = EventUtil.getTarget(event);
var uls = target.parentNode.parentNode;

switch(target){
case "uls.getElementsByTagName("li")[0].getElementsByTagName("a")[0]":
alert(target.nodeValue);
break;

case "uls.getElementsByTagName("li")[1].getElementsByTagName("a")[0]":
alert(target.nodeValue);
break;

case "uls.getElementsByTagName("li")[2].getElementsByTagName("a")[0]":
alert(target.nodeValue);
break;

}
});