禁止别人查看网页源代码

window.onload = function(){
    //屏蔽键盘事件
    document.onkeydown = function (){
        var e = window.event || arguments[0];

        if(e.keyCode == 123){
            //F12
            return false;
        }else if((e.ctrlKey) && (e.shiftKey) && (e.keyCode == 73)){
            //Ctrl+Shift+I
            return false;
        }else if((e.shiftKey) && (e.keyCode == 121)){
            //Shift+F10
            return false;
        }else if((e.ctrlKey) && (e.keyCode == 85)){
            //Ctrl+U
            return false;
        }
    };

    //屏蔽鼠标右键
    document.oncontextmenu = function (){
        return false;
    }
}