監(jiān)聽鍵盤按下鍵的值（兼容IE與其他瀏覽器）
function getKeyPressCode(event) {
/*
//此種方法不可取
if(event.keyCode!=0) // IE
{
keynum = event.keyCode;
}
else if(event.which!=0) // Netscape/Firefox/Opera
{
keynum = event.which;
}
alert(keynum);
*/
//此種方法可行
var keycode;
if (navigator.appName == "Microsoft Internet Explorer") { // IE
keycode = event.keyCode;
} else { // Netscape/Firefox/Opera
keycode = event.which;
}
alert("按鍵碼: " + keycode );
}