nodejs 中模拟实现 emmiter 自定义事件

nodejs 中模拟实现 emmiter 自定义事件

<!DOCTYPE html>

<html>

<head>

<meta charset="UTF-8">

<title></title>

<script>

function Emitter() {

this.events = {}; //存放事件的地方

}

Emitter.prototype.on = function(type, cb) {

var events = this.events;

events = events[type] = events[type] || [];

events.push(cb);

};

Emitter.prototype.emit = function(type) {

var args = [].slice.call(arguments, 1);

var cbs = this.events[type], cb;

while (cb = cbs && cbs.shift()) {

cb.apply(this, args);

}

};

var emitter = new Emitter();

emitter.on('customevent', function(param) {

alert(param);

});

emitter.on('customevent', function() {

alert(1);

});

emitter.emit('customevent', 'xxx');

</script>

</head>

<body>

</body>

</html>

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