jquery禁用右键、文本选择功能、复制按键的实现

//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){  
keynum = e.keyCode; // IE  
}else if(e.which){  
keynum = e.which; // Netscape/Firefox/Opera  
}  
if(keynum == 17){  
alert(“禁止复制内容！”);  
return false;  
}  
}  

//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;}  
        }  
  
   
   
<script>    
//屏蔽鼠标右键、Ctrl+N、Shift+F10、F11、F5刷新、退格键       
function   document.oncontextmenu(){event.returnValue=false;}//屏蔽鼠标右键     
function   window.onhelp(){return false}       //屏蔽F1帮助     
function   document.onkeydown(){     
    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;     
      }     
  }     
</script>