var foucs_a = {
    createNew: function(){
        var cls = {
            id:'',
            cur:0,
            _init: function(id) {
                var over = function(evt) {
                    var _obj = cls;//注意这里，这里是取得父类的对象
                    _obj.next();
                }
                this.id = id;
                jQuery("#fff").bind("mouseover", over);

            },
            next: function() {
                alert(this.cur);
                this.cur++;
            }
        };

        return cls;
    }
};

var fa = foucs_a.createNew();
fa._init();
fa.next();
fa.next();