JavaScript对鼠标键盘、页面等事件的处理，各种无效操作求解

鼠标悬停使图片可见度visible发生变化无效


    <img src="img/observe_star2.jpg" alt="observe_star2" width="200" height="200" style="filter: alpha(opacity=100);" 
        onmouseover="visible(this,1)" onmouseout="visible(this,0)">

        function visible(cursor,i){
            if(i==0) cursor.filters.alpha.opacity=100;
            else cursor.filters.alpha.opacity=50;
        }


点击按钮进行刷新无效

        <input type="button" id="btn_refresh">

        var btn_refresh= document.getElementById("btn_refresh");
        btn_refresh.onkeypress=function(){
            location.reload();
        }


键盘事件点击刷新无效

        //键盘事件
        function refurbish(){
            if(window.event.keyCode==65){
                alert("你点击了这个键，将刷新页面");
                location.reload();
            }
        }
        document.onkeypress = refurbish;


<body onunload="pageClose()">无效

<body onunload="pageClose()">

        function pageClose(){
            alert("welcome to browse this page.");
        }


设置浏览器窗口大小无效

        function fastness(){ //设置浏览器窗口大小
            window.resizeTo(650,500);
        }
        document.body.onload=fastness;
        document.body.onresize = fastness;

 

你是不是应该把js代码放到script标签里啊