请教关于ctrl和shift

【个人意见，仅供参考】试一试<script language="javascript">
function $(objName){
return document.getElementById(objName);
}function addEvent(obj,evt,fn){
if(obj.addEventListener){
obj.addEventListener(evt,fn,false);
}
else if(obj.attachEvent){
obj.attachEvent('on'+evt,fn);
}
}function AdvancedListener(){
this.MouseIsDown = false;
this.CtrlIsPressed = false;
this.ShiftIsPressed = false;
}AdvancedListener.prototype.record = function(e){
if (e == 'mousedown'){
this.MouseIsDown = true;
}
if (e == 'mouseup'){
this.MouseIsDown = false;
}
if (e == 'keydown' && event.keyCode==17){ //ctrl is down
this.CtrlIsPressed = true;
}
if (e == 'keydown' && event.keyCode==16){ //shift is down
this.ShiftIsPressed = true;
}
if (e == 'keyup' && event.keyCode==17){ //ctrl is up
this.CtrlIsPressed = false;
}
if (e == 'keyup' && event.keyCode==16){ //shift is up
this.ShiftIsPressed = false;
}
}var listener = new AdvancedListener();
function StartListening(){
addEvent(document.body,'keydown',function(){listener.record('keydown');Check();});
addEvent(document.body,'keyup',function(){listener.record('keyup');Check();});
addEvent(document.body,'mousedown',function(){listener.record('mousedown');Check();});
addEvent(document.body,'mouseup',function(){listener.record('mouseup');Check();});
}//test code here...
function Check(){
$('container').innerHTML = '';
if(listener.CtrlIsPressed ){
$('container').innerHTML += 'Ctrl pressed<br>';
}
if(listener.ShiftIsPressed ){
$('container').innerHTML += 'Shift pressed<br>';
}
if(listener.MouseIsDown){
$('container').innerHTML += 'MouseLeftButton pressed<br>';
}
if(listener.CtrlIsPressed && listener.MouseIsDown){
$('container').innerHTML += '<h1>Ctrl + Mouse!!!</h1><br>';
}
if(listener.ShiftIsPressed && listener.MouseIsDown){
$('container').innerHTML += '<h1>Shift + Mouse!!!</h1><br>';
}
}
</script>
<body onload="StartListening();">
<div>按一按Ctrl,Shift和鼠标左键</div>
<div id="container"></div>
</body>

解决方案 »

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<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
        <script type="text/javascript">
            function $(id){
                return (document.getElementById(id));
            }

            function isKeyPressed(evt){
                e = window.event || evt
                var msg = "";
                if (e.altKey) {
                    msg += "The ALT key was pressed!";
                }
                if (e.ctrlKey) {
                    msg += "The Ctrl key was pressed!";
                }
                if (e.shiftKey) {
                    msg += "The Shift key was pressed!";
                }
                var o = $("div1");
                o.innerHTML = msg;
            }
        </script>
    </head>
    <body onkeydown="isKeyPressed(event);" onkeyup="isKeyPressed(event);">
        <p>
            按下Ctrl,Alt,Shift键，看看效果。
        </p>
        <div id="div1">
        </div>
    </body>
</html>
改一下响应鼠标事件。<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
        <script type="text/javascript">
            function $(id){
                return (document.getElementById(id));
            }

            function isKeyPressed(evt){
                e = window.event || evt
                var msg = "";
                if (e.altKey) {
                    msg += "The ALT key was pressed!";
                }
                if (e.ctrlKey) {
                    msg += "The Ctrl key was pressed!";
                }
                if (e.shiftKey) {
                    msg += "The Shift key was pressed!";
                }
                var o = $("div1");
                o.innerHTML = msg;
            }
        </script>
    </head>
    <body onmousedown="isKeyPressed(event);">
        <p>
            按下Ctrl,Alt,Shift键，看看效果。
        </p>
        <div id="div1">
        </div>
    </body>
</html>
看看addEventListener（非IE）和addEvent（IE）方法
可以参考楼上的思路，用keycode来检测。但实际应用场景一半比较麻烦，例如你要监听Ctrl+A，那么你必须监听Ctrl的keydown，然后等候A的keydown，这才是一个Ctrl+A。如果Ctrl的keydown后又keyup了，这是A的keydown就没意义了。我的意思是，你要监听组合键，就必须记录每一个键的按下状态。
冤枉呀！
我没用keycode呀！
event里面本来就有 altKey，ctrlKey，shiftKey来标识状态的。
为什么大家还在热火朝天的讨论用keycode呢。
是不是我看错题了？当然用keycode也可以，只是没有必要呀。同时，再贴一个以前回帖时做的，
实现游戏中多键同时按下时的键盘处理。
给大家参考一下。
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    </head>
    <script>
        function $(id){
            return (document.getElementById(id));
        }

        var keybuf = {};
        function keydown(e){
            var evt = e || window.event;
            var o = $("div1");
            keybuf[evt.keyCode] = true;
            whatIsDown();
        }

        function keyup(e){
            var evt = e || window.event;
            var o = $("div1");
            keybuf[evt.keyCode] = false;
            whatIsDown();
        }

        function keypress(e){
            whatIsDown();
        }

        function whatIsDown(){
            var o = $("div1");
            var str = "";
            for (k in keybuf) {
                if (keybuf[k] == true) {
                    str += k + "; ";
                }
            }
            o.innerHTML = str;
        }
    </script>
    <body>
        <input type="text" value="" onkeydown="keydown(event);" onkeyup="keyup(event);" onkeypress="keypress(event);"/>
        <div id="div1">
        </div>
    </body>
</html>