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This article mainly introduces how to do JS reverse, Python how to call JS code related knowledge, the content is detailed and easy to understand, the operation is simple and fast, has a certain reference value, I believe that after reading this to do JS reverse, Python how to call JS code article will have a harvest, let's take a look at it.

Configure the environment

Node.js

Select the version directly under the good, it will automatically join the system environment, check the Node.js version, the emergence of the version number means that the configuration is ready.

Pyexecjs

Basic use of pip install pyexecjs

First check whether the engine used is node.js.

Import execjsprint (execjs.get () .name) run result: Node.js (V8) runs js code

There are two ways for pyexecjs to run js code

1. Eval ()

Eval () can execute js code directly

Import execjsprint (execjs.eval ("a = new Array (1,2,3)")) running result: [1,2,3]

2. Compile ()

If there is a large amount of code, it is recommended to use this method. First, write the js code to a file, and then read and execute it when needed.

Create a js_text.js file and write the following code:

Function a (str) {return str;}

Python Code:

Import execjswith open ('js_text.js',' ritual, encoding='utf-8') as f: jstext = f.read () ctx = execjs.compile (jstext) a = '123456'result = ctx.call (' ajar, a) print (result) run result: 123456

First call compile to compile the js code, and then call the call method to execute. The name of the function in the js code of the first parameter of call, and the second parameter is the parameter needed by the function (if there are multiple parameters, just write down a parameter by comma).

Common problems

The string returned by the js code may make an error if it has special characters.

The solution is to base64 encode the string before returning it.

Function a (str) {return new Buffer (str) .toString ("base64");}

With this method, you do not have to rewrite the code, just buckle the js code to run, sometimes there are some variables undeclared in the buckle code, look for completion in the js code to help you save your brain.

This is the end of the article on "how to call JS code when Python does JS reverse". Thank you for reading! I believe that everyone has a certain understanding of the knowledge of "how to call JS code when doing JS reverse". If you want to learn more, you are welcome to follow the industry information channel.

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