小编Fra*_*vid的帖子

I know "cluster" and "child_process" can use multiple cores of a CPU so that we can achieve true parallel processing.

I also know that the async event loop is single-threaded so we can only achieve concurrency.

My question is about worker_threads:

假设我的电脑有 4 核 CPU 并且我正在执行一个 Nodejs 脚本。该脚本创建三个工作线程。

三个工作线程会利用CPU中剩余的3个核心来实现并行吗？

或者三个工作线程将只使用主核心而其余3个核心不被使用，就像事件循环一样？

我想在图表数据值发生变化时删除旧的 SVG 并创建一个新的 SVG。

import React, {useRef, useEffect, useState} from 'react'
import * as d3 from 'd3'
import { useSelector} from "react-redux";

const Barchart = () =>{
    const chart = useRef(null);
    const chart_data= useSelector(state => state.ChartReducer);

    useEffect(() => {
        let svg = d3.select(chart.current)
        //code to create the chart
        //
        return () => {
            //How to remove the old svg element from the ref chart.current?
            //I tried
            chart.current.removeChild() // This throws an error saying expects 1 argument got 0

        }
    },[chart_data]) …