Web page anti-censorship source code

code directly

document.onkeydown = function(){
      if(window.event && window.event.keyCode == 123) {
          alert( "F12 is disabled" );
          event.keyCode=0;
          event.returnValue=false;
      }
      if(window.event && window.event.keyCode == 13) {
          window.event.keyCode = 505;
      }
      if(window.event && window.event.keyCode == 8) {
          alert(str +"\nPlease use the Del key to delete characters!" );
          window.event.returnValue=false;
      }
  }
  // Add a custom event for the right button, you can disable   
  window.oncontextmenu = function () {  
      event .preventDefault(); // prevent default event behavior   
      return  false ;  
  }  
  // disable pre-debugging and console developer tools 
  var threshold = 160; // width or height threshold to open console  
  // Check every second   
  window.setInterval( function () {  
       if (window.outerWidth - window.innerWidth > threshold ||    
      window .outerHeight - window.innerHeight > threshold) {  
           // window.close();//Close the page 
        CloseWebPage();
      }  
  }, 1e3); 
  function CloseWebPage() {     
    if (navigator.userAgent.indexOf("MSIE") > 0) {     
        if (navigator.userAgent.indexOf("MSIE 6.0") > 0) {     
            window.opener = null;
            window.location.href="about:blank"; 
            window.close();     
        }     
        else {     
            window.open('', '_top'); 
            window.location.href="about:blank";
            window.top.close();     
        }     
    }     
    else if (navigator.userAgent.indexOf("Firefox") > 0) {     
        window .location.href = 'about:blank '; // The default state of Firefox is non-window.open page window.close is invalid    
        //window.history.go(-2);     
    }     
    else {     
        window.opener = null;      
        window.open('', '_self', '');   
        window.location.href="about:blank";  
        window.close();     
    }     
  }