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Promise processing JS multithreads get the same processing result after all the results are obtained

2022-06-13 04:40:00 【AF01】

html Code 

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

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>

    <script>
        function feb(n) {
            if (n == 1 || n == 2) {
                return 1
            }
            return feb(n - 1) + feb(n - 2)
        }
        let a = +new Date();
        let n1 = 30;
        let data2 = feb(n1)
        console.log(data2);
        console.log(' Multithreading not turned on single time consuming ：',+new Date() - a);


        let time1 = +new Date();
        let promiseArr = []
        for (let index = 0; index < 13; index++) {
            let worker = new Worker('worker.js')
            let p = new Promise((resolve, reject) => {
                worker.postMessage(n1)
                worker.onmessage = e => {
                    resolve(e.data)
                }
                worker.onerror = error => {
                    reject(error)
                }
            })
            promiseArr.push(p);
            n1++;
        }


        console.log(promiseArr);
        Promise.all(promiseArr).then(data => {
            console.log(data);
            console.log(' Time consuming to turn on Multithreading ：',+new Date() - time1);
        })

    </script>
</body>

</html>

worker.js

function feb(n) {
    if (n==1||n==2) {
        return 1
    }
    return  feb(n-1)+feb(n-2)
}
let a = +new Date();
let n= 2;
self.onmessage = function(event) {
    n = event.data;
    console.log("onmessage:",event.data);
    let data1 =  feb(n)
    console.log(+new Date()-a);
    self.postMessage(data1)
    self.close();
};

原网站

版权声明
本文为[AF01]所创，转载请带上原文链接，感谢
https://yzsam.com/2022/164/202206130436444079.html

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