JS_eventBind

/*
 * Function.prototype.bind 外置函数;
 * 当连续bind事件的时候无法保证顺序;
 */
if(!Function.prototype.bind){
    Function.prototype.bind = function(){
        var args = Array.prototype.slice.call(arguments);
        var _obj = args.shift();
        var _fun = this;
        return function(){
            return _fun.apply(_obj,args.concat(Array.prototype.slice.call(arguments)));
            };
        };
    }
var eventHandler = {
    add:function(node,en,fu){
        node.addEventListener ? node.addEventListener(en,fu,false) : node.attachEvent("on" + en, fu);
        },
    remove:function(node,en,fu){
        node.removeEventListener ? node.removeEventListener(en,fu,false) : node.detachEvent("on" + en, fu);
        },
    guid:0,
    bind:function(node,en,fu){
        var _this = this;
        fu = fu.bind(node);
        _this.guid++;
        if(!node.evenfun) node.evenfun = {};
        if(!node.evenfun[en])node.evenfun[en] = {};
        node.evenfun[en][_this.guid] = fu;
        _this.add(node,en,node.evenfun[en][_this.guid]);
        },
    unbind:function(node,en){
        var _this = this;
        if(!node.evenfun || !node.evenfun.hasOwnProperty(en)) return;
        for(var i in node.evenfun[en]){
            _this.remove(node,en,node.evenfun[en][i]);
            }
        delete node.evenfun[en];
        },
    bindBn:function(node,en,fu){
        var funame = fu.toString(),_this = this;
        fu = fu.bind(node);
        if(!node.evenfun) node.evenfun = {};
        if(!node.evenfun[en])node.evenfun[en] = {};
        node.evenfun[en][funame] = fu;
        _this.add(node,en,node.evenfun[en][funame]);
        },
    unbindBn:function(node,en,name){
        var _this = this;
        name = name.toString();
        if(!node.evenfun || !node.evenfun[en].hasOwnProperty(name)) return;
        _this.remove(node,en,node.evenfun[en][name]);
        delete node.evenfun[en][name];
        }
    }