Use webworker to perform background tasks

     according to MDN Official explanation ：Web Worker by Web Content running scripts in a background thread provides a simple way . Threads can perform tasks without interfering with the user interface .（ Click here to , Check the website ）.

Worker Notes on the use of sub threads

special Worker Share with Worker

     In dedicated workers Under the circumstances ,DedicatedWorkerGlobalScope The object represents worker The context of （ special workers Refers to the standard worker Only used in a single script ; share worker The context is SharedWorkerGlobalScope (en-US) object ）. A dedicated worker It can only be used by the script that generated it for the first time , And share worker Can be used by multiple scripts at the same time .
     The following examples belong to “ special Worker”.

Worker Restrictions on use

     stay worker Inside , Can't operate directly DOM node , Can't be used window Object's default methods and properties . But you can use a lot window Things under objects , Include WebSockets,IndexedDB as well as FireFox OS A dedicated Data Store API And so on .
     namely ： In the use of Worker When the sub thread executes background tasks ,Worker Object can be called window Properties and methods , What are the details ？ can