禁用键盘上的(全局)指定键兼容iE、Chrome、火狐

NoExec = function(event) { 
var k = event.which || event.keyCode; 
if (k == 13 || k == 38 || k == 40) { 
if ($("#atWinByArea").attr("id")) { 
if (event.which) {//火狐 
event.preventDefault(); 
} else {//IE、Chrome 
event.returnValue = false; 
} 
} 
} 
downAt(event); 
} 
var target = document.getElementById("saytext"); //指定的的控件Id 
if (target.addEventListener) {//绑定监听 
target.addEventListener("keydown", NoExec, false); 
target.addEventListener("keypress", NoExec, false); 
} else if (target.attachEvent) { 
target.attachEvent("onkeydown", NoExec); 
} 
 
如果是全局的 就只要监听window.keyDown = function(event){.....} 一样一样的！~ 
键盘所对应的key值链接