网页限制复制打印查看源代码的屏蔽和解封

<script>
 var iscopy=0;
 
document.body.oncopy = function (){
        var url = window.location.href;
        if (iscopy==0){
          //  my_pays(url,site)
            console.log('禁止复制');
        }else {
            if (iscopy==1){
                return true;
            }
        }
        return false;
}
window.onkeydown = function(e){
        if(e.keyCode == 83&&e.ctrlKey){  //ctrl+s
            console.log('禁止保存');
            return false;
        }
        if(e.keyCode == 67&&e.ctrlKey){  // ctrl+c
            var url = window.location.href;
            if (iscopy==0){
                //my_pays(url,site)
                console.log('禁止复制');
            }else {
                if (iscopy==1){
                    return true;
                }
            }
            return false;
        }
        if(e.keyCode == 88&&e.ctrlKey){  //ctrl+x
            var url = window.location.href;
            if (iscopy==0){
                //my_pays(url,site)
                console.log('禁止复制剪切');
            }else {
                if (iscopy==1){
                    return true;
                }
            }
            return false;
        }
        if(e.keyCode == 85&&e.ctrlKey){   //ctrl+u
            console.log('禁止查看源码');
            return false;
        }
        if(e.keyCode == 123){  //f12
            console.log('禁止查看元素');
            return false;
        }
               if(e.keyCode == 80&&e.ctrlKey){  //ctrl+p
            console.log('禁止打印');
            return false;
        }
    }

</script>

解封的办法也很简单，鼠标在地址栏上点一下，然后再用快捷键，就跳出了document的限制。