javascript事件绑定（移除）/ javascript事件如何传参？

 

function addEvent (obj, type, fn, opts) {
        //obj 添加事件的对象
        //type 要添加的事件类型如：'click'、‘mouseover’等
        //fn 要添加的事件，function
        //opts要传入的参数
        obj['evt' + type + fn] = obj['evt' + type + fn] || null;
        if (!obj['evt' + type + fn]) {
            obj['evt' + type + fn] = function (event) {
                var event = event || window.event;
                event.datas = opts || {};
                fn.call(obj, event);
            };
        }

        if (obj.addEventListener) {//W3C
            obj.addEventListener(type, obj['evt' + type + fn], false);
        } else if (obj.attachEvent) {
            obj.attachEvent('on' + type, obj['evt' + type + fn]);
        }
    }

    function removeEvent(obj, type, fn) {//删除事件
        if (typeof obj.removeEventListener != 'undefined') {
            obj.removeEventListener(type, obj['evt' + type + fn], false);
        } else if (typeof obj.detachEvent != 'undefined') {
            if(fn && obj['evt' + type + fn]) {
                obj.detachEvent("on" + type,obj['evt' + type + fn]);
            }else{
                obj['on'+type] = null
            }
        }
    }