function Box(){
this.handlers = {};
}
Box.prototype = {
//on() 用于绑定自定义事件;
on: function(type, handler){
if (typeof this.handlers[type] == 'undefined'){
this.handlers[type] = [];//給每个事件名定义个一个数组
}
this.handlers[type].push(handler);//把每个事件函数添加到数组
},
//fire触发自定义事件
fire: function(type, data){
if (this.handlers[type] instanceof Array){
var handlers = this.handlers[type];
for (var i = 0, len = handlers.length; i < len; i++){
handlers[i](data);
}
}
}
}
var oBox = new Box();
oBox.on('alert', function(){
alert("hello1");
});
oBox.on('alert', function(){
alert("hello2");
});
oBox.on('alert', function(){
alert("hello3");
});
var btn = document.getElementById('btn');
btn.onclick = function(){
oBox.fire('alert');
}
<button id = 'btn'style="width: 150px;height: 30px;position: relative; left: 500px;top: 200px;">点击我将触发三个自定义的alert事件</button>
<script type="text/javascript" src='box.js'></script>