jQuery移除元素自动解绑事件实现思路及代码

define(['jquery','underscore'],function () {
var bindDirects = ['delegate','bind','on','hover','blur','change','click','dblclick','focus','keydown','keypress','keyup','mousedown','mouseenter','mouseleave','mousemove','mouSEOut','mouSEOver','mouseup','resize','scroll','select','submit'];
var eMarker = '_addedEvent';
_.each(bindDirects,function (eventName) {
var alias = $.fn[eventName];
$.fn[eventName] = function () {
var $tar = _.isElement(this)?$(this):this;
var hasEventAdded = $tar.attr(eMarker) || '';
var _en = eventName;
if (hasEventAdded.length) {
_en += ',' + hasEventAdded;
}
$tar.attr(eMarker,_en);
return alias.apply(_.isElement(this)?$tar:this,[].slice.call(arguments));
};
});
// 为某一个元素移除绑定的事件
function removeEvents($tar) {
var addedEventsName = $tar.attr(eMarker);
if (addedEventsName) {
addedEventsName.replace(/[^,]+/g,function (eventName) {
// 全部移除
if (eventName === 'delegate') {
$tar.undelegate();
} else {
$tar.unbind();
}
return eventName;
});
}
}

var funcs = ['html','empty'];
_.each(funcs,function (func) {
var alias = $.fn[func];
$.fn[func] = function () {
var $tar = _.isElement(this)?$(this):this;
if($tar.length){
$tar.find('*[' + eMarker + ']').each(function (k,subEl) {
try{
removeEvents($(subEl));
}catch(e){
console.error(e.message);
}
});
}
var args = [].slice.call(arguments);
return alias.apply($tar,args);
};
});
// 扩展remove()方法
var alias = $.fn.remove;
$.fn.remove = function () {
var $tar = _.isElement(this)?$(this):this,
arg = arguments;
if($tar.length && !arg.length){
$tar.find('*[' + eMarker + ']').each(function (k,subEl) {
try{
removeEvents($(subEl));
}catch(e){
console.error(e.message);
}
});
}
if(arg.length){
var selector = arg[0];
if(_.isString(selector)){
$tar.find(selector).each(function(k,curEl){
var $cur = $(curEl);
$cur.find('*[' + eMarker + ']').each(function (k,subEl) {
try{
removeEvents($(subEl));
}catch(e){
console.error(e.message);
}
});
removeEvents($cur);
$cur.remove();
});
}
}
var args = [].slice.call(arguments);
return alias.apply($tar,args);
};
});