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| var observer = (function () {
var subscribers = {};
return {
listen: function (key, fn) {
subscribers[key] = subscribers[key] || [];
subscribers[key].push(fn);
},
trigger: function () {
var key = Array.prototype.shift.call(arguments);
var subscriberList = subscribers[key];
if (!subscriberList || subscriberList.length < 0) {
return;
}
for (var i = 0; i < subscriberList.length; i++) {
var fn = subscriberList[i];
fn.apply(this, arguments);
}
},
remove: function (key, fn) {
var fns = subscribers[key];
if (!fns) {
return;
}
if (!fn) {
delete subscribers[key];
} else {
for (var i = 0; i < fns.length; i++) {
if (fn === fns[i]) {
fns.splice(i, 1);
}
}
}
}
}
})();
var fn = function (msg) {
console.log("收到消息：" + msg);
}
observer.listen('ly', fn);
observer.trigger('ly', 'hello world');
observer.remove('ly', fn);
|
