2-- Interview Summary - js-depth understanding of thread Advanced - micro-macro task task

• • Preface:
    Event Loop That time cycle, refers to a browser or Node settlement mechanism does not block the javascript single-threaded runtime, that is, we often use asynchronous principle
  • Js operating mechanism
         1, different operating environment, js operating results are inconsistent
         2, nodeJs based libuv implemented, reference http://docs.libuv.org/en/v1.x/design.html
         . 3, based Chorme
  • Micro-macro task task
        
    • Macro task, macrotask also called tasks. Some callback asynchronous tasks will be time to enter the macro task queue, waiting for the follow-up continue to be invoked, these asynchronous tasks include:
      • setTimeout
      • setInterval
      • setImmwsiate (Node Germany Yes)
      • I / O
      • UI rendering (unique browsers)
    • Micro tasks, microtask, also known as jobs. Other asynchronous tasks callback time into the micro task queue, waiting to be called follow-up, these tasks include asynchronous
      
      • process.NextTick (Node exclusive)
      • Promise.then()
      • Object.observe
      • MutationObserver
      • (Note: This is only for browsers and NodeJs)
    • ----- Note: new Promise () Constructor which belongs to the synchronization code, rather than micro-task
    • The browser all the macro tasks are executed in an event queue
      every time the event queue tasks put out a micro-micro executing the tasks of an event, and then began to execute event
      • A time to take a macro task
      • Micro perform multiple tasks
      • Micro tasks will be placed at the end of the current cycle time