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web-worker 独立线程，避免主线程阻塞

ref: https://github.com/zjy4fun/web-worker

分别使用主线程和 worker 线程处理一个耗时计算，看看对主线程上的 UI 渲染有什么影响

 

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Web Worker</title>
</head>

<body>
    <script>
        function task() {
            let sum = 0;
            for (let i = 0; i < 1e9; i++) {
                sum += i;
            }
            return sum;
        }

        function mainThread() {
            console.time("主线程计算耗时");
            task();
            console.timeEnd("主线程计算耗时");
        }
        mainThread();
    </script>
    <h1>Main Thread</h1>
</body>

</html>

 

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Web Worker</title>
</head>

<body>
    <script>
        function workerThread() {
            console.time("Web Worker计算耗时");
            const worker = new Worker("worker.js");
            worker.postMessage("Hello, Web Worker!");
            worker.onmessage = function (event) {
                console.timeEnd("Web Worker计算耗时");
                console.log("Received message from worker:", event.data);
            }
        }
        workerThread();
    </script>
    <h1>Web Worker Thread</h1>
</body>

</html>
self.onmessage = function (event) {
    function task() {
        let sum = 0;
        for (let i = 0; i < 1e9; i++) {
            sum += i;
        }
        return sum;
    }
    const result = task();
    self.postMessage(result);
};

 

对比效果

 

可以看出使用 web worker 可以避免让主线程阻塞

 

posted @ 2024-09-05 15:28  zjy4fun  阅读(10)  评论(0)  编辑  收藏  举报