什么是`LS`， 什么是Electron呢？

Question

我在看代码的时候：// If debug isn't set in LS, and we're in Electron, try to load $DEBUG  if (!r && typeof process !== 'undefined' && 'env' in process) {    r = process.env.DEBUG;  }这句话怎么理解？If debug isn't set in LS, and we're in Electron什么是LS， 什么是Electron呢？