js代码实现禁用f12以及复制功能

<script>
     // 禁用f12及复制
     _document.onselectstart=function(){return false;};
          _window.oncontextmenu=function(){return false;}  
          _window.onkeydown = _window.onkeyup = _window.onkeypress = function (event) { 
         if(event.code == 'F12'){
           window.event.returnValue = false; 
            return false;
          }
         }
</script>