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; 
    } 
    } 
     
    //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      
    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;    
          }    
      }