javascript使用nsIObserverService

实现nsIObserver

var testObserver = {   observe: function(subject, topic, data) {   alert(topic+data);     if (topic != "testTopic") {       return;     }     } };

调用 nsIObserverService

function testObserverService(){  netscape.security.PrivilegeManager.enablePrivilege('UniversalXPConnect');  var obj = Components.classes["@mozilla.org/observer-service;1"].             getService(Components.interfaces.nsIObserverService);                          obj.addObserver(testObserver,"testTopic",false);                          obj.notifyObservers( null,"testTopic","start")             obj.removeObserver(testObserver, "testTopic");                       }