同时适合IE、firefox、谷歌浏览器下适用，经过筛选代码如下：

//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;
    }
}

//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) || (window.event.keyCode==39))){
        alert("不准你使用ALT+方向键前进或后退网页！");
        event.returnValue=false;
    }
    if((event.keyCode==8) || (event.keyCode==116) || (event.ctrlKey && event.keyCode==82)){
    //分别屏蔽退格删除键、F5刷新键、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){
        //屏蔽shift加鼠标左键新开一网页
        window.event.returnValue=false;
    }
    if((window.event.altKey)&&(window.event.keyCode==115)){
        //屏蔽Alt+F4
        window.showModelessDialog("about:blank","","dialogWidth:1px;dialogheight:1px");
        return false;
    }
}