封装了一个支持匿名函数的Javascript事件监听器_javascript技巧

主要代码：
代码如下:
/*绑定事件与取消绑定*/
var handleHash = {};
var bind = (function() {
if (window.addEventListener) {
return function(el, type, fn, capture) {
el.addEventListener(type, function(){
fn();
handleHash[type] = handleHash[type] || [];
handleHash[type].push(arguments.callee);
}, capture);
};
} else if (window.attachEvent) {
return function(el, type, fn, capture) {
el.attachEvent("on" + type, function(){
fn();
handleHash[type] = handleHash[type] || [];
handleHash[type].push(arguments.callee);
});
};
}
})();
var unbind = (function(){
if (window.addEventListener) {
return function(el, type ) {
if(handleHash[type]){
var i = 0, len = handleHash[type].length;
for (i; i el.removeEventListener(type, handleHash[type][i]);
}
};
};
} else if (window.attachEvent) {
return function(el, type) {
if(handleHash[type]){
var i = 0, len = handleHash[type].length;
for (i; i el.detachEvent("on" + type, handleHash[type][i]);
}
};
};
}
})();

原理解析：

handleHash做哈希表缓存事件的function，handleHash['事件名称']是一个数组，来添加多个事件监听的方法，unbind哪个事件的时候遍历handleHash['事件名称']的数组，然后移除。

使用：
代码如下:
bind(obj,'click',function(){
alert ('click');
});
unbind(obj,'click');