html5 worker example (1) Why the test fails to work

Many people always encounter exceptions when testing the worker API and cannot test the effect at all.
One thing you must pay attention to when using workers is that a simple text file cannot implement a worker. The actual code you write must be deployed to the server (tomcat.jBoss, etc.) to run the worker api.
Write a simple example below

js code test.js (worker)

function messageHandler(e) { 
postMessage("worker says: " + e.data + " too"); 
} 
addEventListener("message", messageHandler, true); 
postMessage("2222222222");

html code index.html

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