function clickSiftSoft() {
   if (event.button != 1) {
        //alert("思特软件版权所有");
        window.event.returnValue = false;
   }
}
//document.onmousedown = clickSiftSoft;
document.oncontextmenu = clickSiftSoft;

window.ClearEvent = function() {
  event.cancelBubble = false;
  var sSrcTagName = event.srcElement.tagName.toLowerCase();
  return (sSrcTagName=="textarea" || sSrcTagName=="input" || sSrcTagName=="select");
}
window.ClearKey = function() {
//  if (event.shiftKey) {
//    alert("禁止使用Shift键！");
//    return false;
//  }
  event.cancelBubble=false;
  var iKeyCode=event.keyCode;
  return !(iKeyCode==78 && event.ctrlKey);
}
with (window.document) {
  oncontextmenu=onselectstart=ondragstart=window.ClearEvent;
  onkeydown=window.ClearKey;
}