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Introduction to Web Worker

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Introduction to Web Worker

In general, the browser will block the execution of a program until it returns to a normal state after the end of the run, and the HTML5 web worker is to solve the problem. Intensive calculations through worker threads to avoid program blocking and page lag (fps too low )

Example

Simulate the test with the Fibonacci sequence.

Worker-test.html

<! DOCTYPE html>

Worker.js

function fibonacci(n) { return n < 2 ? n : arguments.callee(n-1) + arguments.callee(n-2);}self.addEventListener(‘message‘, function (event) { let result = fibonacci(event.data); self.postMessage(result);});

Assume that the main page needs to perform time-consuming operations (such as: Fibonacci) multiple times, which can be performed asynchronously with workers as follows.

<!DOCTYPE html>

Introduction to Web Worker

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