WebWorker example using importScript

webworker.example.js

Webworker

// worker.js

var ju;

addEventListener('message', function(e) {
  if (e.data == "dummy") {
    importScripts('./JapaneseUtil.js');
    console.log("this worker on message...", e);
    if (!ju) ju = JapaneseUtil();
    let arr = ju.separate("私は、日本語が得意です。");
    postMessage(arr); 
  }
}, false);


// main.js

var worker;

document.querySelector("#btn3").onclick = function() {
  if(!worker) {
    worker = new Worker("worker.js");
    worker.onmessage = function (e) {
      console.log("e", e);
    }
  }
  worker.postMessage("dummy"); // Start the worker.
}