function Click(){
	//禁止右键
     window.event.returnValue = false;
}
function KeyDown(){
	if(window.event.ctrlKey){//Ctrl+键组合
    if(window.event.keyCode !== 67 && window.event.keyCode !== 80 && window.event.keyCode !== 86 && window.event.keyCode !== 88 && window.event.keyCode !== 90){//限制在复制、打印
      try{
        event.keyCode = 0;
        event.returnValue = false;
      }catch(e){
      
      }
    }
	}
	//禁止F5刷新
	if (window.event.keyCode == 116)
	{	
		event.keyCode = 0;
		event.returnValue = false;
	}
}
//防止对话框中有人点击超联接,造成showcontent 变成其它联连接而网页出错
function Click2(){
	window.event.returnValue = false;
	return ;
}
document.oncontextmenu = Click;
document.onmousedown = Click2; 
document.onkeydown = KeyDown;