jquery 禁止复制 F5 等

//禁用右键、文本选择功能、复制按键
$(document).bind("contextmenu",function(){return false;});
$(document).bind("selectstart",function(){return false;});
$(document).keydown(function(){return key(arguments[0])});

//按键时提示警告
function key(e){
    var keynum;
    if(window.event) // IE
      {
        keynum = e.keyCode;
      }
    else if(e.which) // Netscape/Firefox/Opera
      {
        keynum = e.which;
      }
    if(keynum == 17){ alert("禁止复制内容！");return false;}
}


//屏蔽鼠标右键、Ctrl+N、Shift+F10、F11、F5刷新、退格键
$(document).contextmenu(function(){
    event.returnValue=false;
})//屏蔽鼠标右键
window.onhelp(){return false}       //屏蔽F1帮助
$(document).keydown(function(){
  if((window.event.altKey)&&
  ((window.event.keyCode==37)||            //屏蔽Alt+方向键←
  (window.event.keyCode==39))){            //屏蔽Alt+方向键→
       alert("不准你使用ALT+方向键前进或后退网页！");
       event.returnValue=false;
  }         if((event.keyCode==8)||                    //屏蔽退格删除键
  (event.keyCode==116)||                   //屏蔽F5刷新键
  (event.ctrlKey && event.keyCode==82)){   //Ctrl+R
       event.keyCode=0;
       event.returnValue=false;
  }
  if(event.keyCode==122){event.keyCode=0;event.returnValue=false;}    //屏蔽F11
  if(event.ctrlKey && event.keyCode==78)event.returnValue=false;      //屏蔽Ctrl+n
  if(event.shiftKey && event.keyCode==121)event.returnValue=false;    //屏蔽shift+F10
  if(window.event.srcElement.tagName=="A" && window.event.shiftKey)
     window.event.returnValue=false;       //屏蔽shift加鼠标左键新开一网页
  if((window.event.altKey)&&(window.event.keyCode==115)){             //屏蔽Alt+F4
     window.showModelessDialog("about:blank","","dialogWidth:1px;dialogheight:1px");
     return false;
  }
} );