var addLicenseFnNotOverride = function(dom,event,fn){
    //字串處理，去掉'on'
var evString = event.substr(0,2);
    if(evString == 'on'){
        event = event.substr(2);
    }
    //瀏覽器相容性處理
if(window.addEventListener){
        dom.addEventListener(event,fn,false);
    }else if(window.attachEvent){
        dom.attachEvent
 
("on"+event,fn);
    }else{
        var oldFn = dom["on"+event];
        if(typeof oldFn==="function"){
            // 通過匿名函式方式，將兩個函式在點選後執行。
dom["on"+event] = function (){
                oldFn();
                fn();
                //dom["on"+event]=null;//只執行一次
}
        }else{
            dom["on"+event] = fn;
        }
    }
};