Prototype实战教程----12.Event.observe

script src="prototype.js"/scriptinput type="button" id="btn" value="click" /input type="button" id="reg" value="register" /input type="button" id="unreg" value="unregister" /div id="status"/divscriptfunction test() {　　alert("clicked");}　　Event.observe("reg", "click", function () {　　　　Event.observe("btn", "click", test, false);　　　　$("status").innerHTML = "event registered";　　}, false);Event.observe("unreg", "click", function () {　　　　Event.stopObserving("btn", "click", test, false);　　　　$("status").innerHTML = "event unregistered";　　}, false);/script