As for ECMAScript 6 Generator function, Can I toggle execute Permission like example

generator.js

// How Can I return execute permission to 'generator_B'
function * generator_A() {
  yield 'ga_1'
  yield 'ga_2'
  yield * generator_B()
  yield 'ga_3'
  yield 'ga_4'
}
function * generator_B() {
  yield 'gb_1'
  yield 'gb_2'
  yield * generator_A()
  yield 'gb_3'
  yield 'gb_4'
}
for (let val of generator_A()) {
  console.log(val)
}
// The console is 'ga_1' -> 'ga_2' -> 'gb_1' -> 'gb_2' -> 'ga_1' -> 'ga_2' ....
// But I want the result is 'ga_1' -> 'ga_2' -> 'gb_1' -> 'gb_2' -> 'ga_3' -> 'ga_4'