How do I hide javascript code in a webpage? [dupli

2019-01-01 12:59发布

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问题:

This question already has an answer here:

  • how to hide javascript code [duplicate] 4 answers

Is it possible to hide the Javascript code from the html of a webpage, when the source code is viewed through the browsers View Source feature?

I know it is possible to obfuscate the code, but I would prefer it being hidden from the view source feature.

回答1:

I\'m not sure anyone else actually addressed your question directly which is code being viewed from the browser\'s View Source command.

As other have said, there is no way to protect javascript intended to run in a browser from a determined viewer. If the browser can run it, then any determined person can view/run it also.

But, if you put your javascript in an external javascript file that is included with:

<script type=\"text/javascript\" src=\"http://mydomain.com/xxxx.js\"></script>

tags, then the javascript code won\'t be immediately visible with the View Source command - only the script tag itself will be visible that way. That doesn\'t mean that someone can\'t just load that external javascript file to see it, but you did ask how to keep it out of the browser\'s View Source command and this will do it.

If you wanted to really make it more work to view the source, you would do all of the following:

  1. Put it in an external .js file.
  2. Obfuscate the file so that most native variable names are replaced with short versions, so that all unneeded whitespace is removed, so it can\'t be read without further processing, etc...
  3. Dynamically include the .js file by programmatically adding script tags (like Google Analytics does). This will make it even more difficult to get to the source code from the View Source command as there will be no easy link to click on there.
  4. Put as much interesting logic that you want to protect on the server that you retrieve via ajax calls rather than do local processing.

With all that said, I think you should focus on performance, reliability and making your app great. If you absolutely have to protect some algorithm, put it on the server, but other than that, compete on being the best at you do, not by having secrets. That\'s ultimately how success works on the web anyway.



回答2:

No, it isn\'t possible.

If you don\'t give it to the browser, then the browser doesn\'t have it.

If you do, then it (or an easily followed reference to it) forms part of the source.



回答3:

Use Html Encrypter The part of the Head which has

<link rel=\"stylesheet\" href=\"styles/css.css\" type=\"text/css\" media=\"screen\" />
<script type=\"text/javascript\" src=\"script/js.js\" language=\"javascript\"></script>

copy and paste it to HTML Encrypter and the Result will goes like this
and paste it the location where you cut the above sample

<Script Language=\'Javascript\'>
<!-- HTML Encryption provided by iWEBTOOL.com -->
<!--
document.write(unescape(\'%3C%6C%69%6E%6B%20%72%65%6C%3D%22%73%74%79%6C%65%73%68%65%65%74%22%20%68%72%65%66%3D%22%73%74%79%6C%65%73%2F%63%73%73%2E%63%73%73%22%20%74%79%70%65%3D%22%74%65%78%74%2F%63%73%73%22%20%6D%65%64%69%61%3D%22%73%63%72%65%65%6E%22%20%2F%3E%0A%3C%73%63%72%69%70%74%20%74%79%70%65%3D%22%74%65%78%74%2F%6A%61%76%61%73%63%72%69%70%74%22%20%73%72%63%3D%22%73%63%72%69%70%74%2F%6A%73%2E%6A%73%22%20%6C%61%6E%67%75%61%67%65%3D%22%6A%61%76%61%73%63%72%69%70%74%22%3E%3C%2F%73%63%72%69%70%74%3E%0A\'));
//-->

HTML ENCRYPTER Note: if you have a java script in your page try to export to .js file and make it like as the example above.

And Also this Encrypter is not always working in some code that will make ur website messed up... Select the best part you want to hide like for example in <form> </form>

This can be reverse by advance user but not all noob like me knows it.

Hope this will help



回答4:

My solution is inspired from the last comment. This is the code of invisible.html

<script src=\"http://code.jquery.com/jquery-1.8.2.js\"></script>
<script type=\"text/javascript\" src=\"invisible_debut.js\" ></script>
<body>
</body>

The clear code of invisible_debut.js is:

$(document).ready(function () {
var ga = document.createElement(\"script\"); //ga is to remember Google Analytics ;-)
ga.type = \'text/javascript\';
ga.src = \'invisible.js\';
ga.id = \'invisible\';
document.body.appendChild(ga);
$(\'#invisible\').remove();});

Notice that at the end I\'m removing the created script. invisible.js is:

$(document).ready(function(){
    alert(\'try to find in the source the js script which did this alert!\');
    document.write(\'It disappeared, my dear!\');});

invisible.js doesn\'t appear in the console, because it has been removed and never in the source code because created by javascript.

Concerning invisible_debut.js, I obfuscated it, which means that it is very complicated to find the url of invisible.js. Not perfect, but enought hard for a normal hacker.



回答5:

I\'m not sure there\'s a way to hide that information. No matter what you do to obfuscate or hide whatever you\'re doing in JavaScript, it still comes down to the fact that your browser needs to load it in order to use it. Modern browsers have web debugging/analysis tools out of the box that make extracting and viewing scripts trivial (just hit F12 in Chrome, for example).

If you\'re worried about exposing some kind of trade secret or algorithm, then your only recourse is to encapsulate that logic in a web service call and have your page invoke that functionality via AJAX.



回答6:

\'Is not possible!\'

Oh yes it is ....

//------------------------------
function unloadJS(scriptName) {
  var head = document.getElementsByTagName(\'head\').item(0);
  var js = document.getElementById(scriptName);
  js.parentNode.removeChild(js);
}


//----------------------
function unloadAllJS() {
  var jsArray = new Array();
  jsArray = document.getElementsByTagName(\'script\');
  for (i = 0; i < jsArray.length; i++){
    if (jsArray[i].id){
      unloadJS(jsArray[i].id)
    }else{
      jsArray[i].parentNode.removeChild(jsArray[i]);
    }
  }      
}


回答7:

You could use document.write.

Without jQuery

<!DOCTYPE html>
<html>
<head><meta charset=utf-8></head>
<body onload=\"document.write(\'<!doctype html><html><head><meta charset=utf-8></head><body><p>You cannot find this in the page source. (Your page needs to be in this document.write argument.)</p></body></html>\');\">
</body></html>

Or with jQuery

$(function () {
  document.write(\"<!doctype html><html><head><meta charset=utf-8></head><body><p>You cannot find this in the page source. (Your page needs to be in this document.write argument.)</p></body></html>\")
});


回答8:

I think I found a solution to hide certain JavaScript codes in the view source of the browser. But you have to use jQuery to do this.

For example:

In your index.php

<head>
<script language = \'javascript\' src = \'jquery.js\'></script>
<script language = \'javascript\' src = \'js.js\'></script>
</head>

<body>
<a href = \"javascript:void(null)\" onclick = \"loaddiv()\">Click me.</a>

<div id = \"content\">
</div>

</body>

You load a file in the html/php body called by a jquery function in the js.js file.

js.js

function loaddiv()
{$(\'#content\').load(\'content.php\');}

Here\'s the trick.

In your content.php file put another head tag then call another js file from there.

content.php

<head>
<script language = \'javascript\' src = \'js2.js\'></script>
</head>

<a href = \"javascript:void(null)\" onclick = \"loaddiv2()\">Click me too.</a>

<div id = \"content2\">
</div>

in the js2.js file create any function you want.

example:

js2.js

function loaddiv2()
{$(\'#content2\').load(\'content2.php\');}

content2.php

<?php
echo \"Test 2\";
?>

Please follow link then copy paste it in the filename of jquery.js

http://dl.dropbox.com/u/36557803/jquery.js

I hope this helps.



回答9:

Is not possbile!

The only way is to obfuscate javascript or minify your javascript which makes it hard for the end user to reverse engineer. however its not impossible to reverse engineer.



标签： javascript browser hide obfuscation
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