其实小程序都是ecmascript写的，了解一下运行机制，改写一下ast即可。
例如：静态扫描，静态分析，都是大概分析出结果。

何为ast

示例代码：

var a = 1;

ast分析网站：
https://astexplorer.net/

{
  "type": "File",
  "start": 0,
  "end": 10,
  "loc": {
    "start": {
      "line": 1,
      "column": 0
    },
    "end": {
      "line": 1,
      "column": 10
    }
  },
  "errors": [],
  "program": {
    "type": "Program",
    "start": 0,
    "end": 10,
    "loc": {
      "start": {
        "line": 1,
        "column": 0
      },
      "end": {
        "line": 1,
        "column": 10
      }
    },
    "sourceType": "module",
    "interpreter": null,
    "body": [
      {
        "type": "VariableDeclaration",
        "start": 0,
        "end": 10,
        "loc": {
          "start": {
            "line": 1,
            "column": 0
          },
          "end": {
            "line": 1,
            "column": 10
          }
        },
        "declarations": [
          {
            "type": "VariableDeclarator",
            "start": 4,
            "end": 9,
            "loc": {
              "start": {
                "line": 1,
                "column": 4
              },
              "end": {
                "line": 1,
                "column": 9
              }
            },
            "id": {
              "type": "Identifier",
              "start": 4,
              "end": 5,
              "loc": {
                "start": {
                  "line": 1,
                  "column": 4
                },
                "end": {
                  "line": 1,
                  "column": 5
                },
                "identifierName": "a"
              },
              "name": "a"
            },
            "init": {
              "type": "NumericLiteral",
              "start": 8,
              "end": 9,
              "loc": {
                "start": {
                  "line": 1,
                  "column": 8
                },
                "end": {
                  "line": 1,
                  "column": 9
                }
              },
              "extra": {
                "rawValue": 1,
                "raw": "1"
              },
              "value": 1
            }
          }
        ],
        "kind": "var"
      }
    ],
    "directives": []
  },
  "comments": []
}

即可分析出相关运行结构

改写ast工具

1. est家族
   const esprima = require("esprima");
   const estraverse = require("estraverse");
   const escodegen = require("escodegen");
   const escope = require('escope');

2. acorn
   const acorn = require("acorn");

3. recast解析器，可另选择ast
   const recast = require("recast");

4. babel-parser babel家族
   const babel = require('@babel/parser');
   const babeltraverse = require('@babel/traverse').default;
   const t = require('@babel/types');
   const generate = require('@babel/generator').default;
   const template = require('@babel/template').default;