window.οnlοad=function(){

                document.οnkeydοwn=function(){

                    var e=window.event||arguments[0];

                        if(e.keyCode==123){

                            alert("哈哈哈");

                            return false;

                        }

                        else if((e.ctrlKey)&&(e.shiftKey)&&(e.keyCode==73)){

                        alert("哈哈哈");

                        return false;

                        }

                };

            }