This project forked from wuhan005/douyin_signature
贝拉，我真的好喜欢你啊！为了你，我要逆抖音 VM！
贝拉，我真的好喜欢你啊！为了你，我要逆抖音 VM！
本项目为抖音 Web https://www.iesdouyin.com/web/api 系列 API 接口，_signature 参数计算代码。
抖音 Web 端使用 JavaScript 实现了一个基于栈的虚拟机，虚拟机源码见 vm.js，来实现对 _signature 参数的计算。
经过对虚拟机 opcode 的分析，并打印出程序的运行流程进行分析。纯靠着眼拔把整个流程给理清了。其中流程有尝试创建 canvas 元素来确保是在浏览器中运行，_signature 参数基于用户输入的字符串、当前时间戳、浏览器 User-Agent 生成。
逆向整理后的源码在 douyin_signature.js，Web 手第一次做逆向，也不会编译原理，只能在 opcode 中打印 log 硬怼。
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