JS脚本动态给控件添加事件

var addEvent = function addEvent(obj, evtType, fn) {
            if (obj.addEventListener) {
                obj.addEventListener(evtType, fn, true);
                return true;
            }
            else if (obj.attachEvent) {
                var temp = obj.attachEvent("on" + evtType, fn);
                return temp;
            }
            else {
                return false;
            }

};