如何在React中将像js代码这样的组件从另一个前端项目插入到组件函数中？

如何解决如何在React中将像js代码这样的组件从另一个前端项目插入到组件函数中？

我想在我的react项目中实现以下scracth前端组件，我已经嵌入了html和css，但是由于jsx无法识别很多语法，所以我不知道将js代码放在哪里。我做？非常感谢您的帮助！

HTML

<figure id="bridgeContainer">
<canvas id="bridge" width="750" height="465"></canvas>
  <figcaption>Downtown Calgary in 2013 and 1943; mouse down or touch on photo to reveal</figcaption>
</figure>

SCSS

body { margin: 0; }

#bridge {
    display: block;
    margin: 0 auto;
  background-image: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/calgary-bridge-1943.jpg');
    background-image: -webkit-image-set(url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/calgary-bridge-1943.jpg') 1x,url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/calgary-bridge-1943-2x.jpg') 2x );
    background-size: cover;
    width: 100%;
    max-width: 750px;
    height: auto;
  cursor:  crosshair;
  cursor: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/circular-cursor.png) 53 53,crosshair;
}
#bridgeContainer { 
  text-align: center;
  font-family: Avenir,sans-serif;
}
#bridgeContainer figcaption {   
  margin-top: 2rem; 
}

这是我想包含在我的react组件中的js

js

var bridge = document.getElementById("bridge"),bridgeCanvas = bridge.getContext('2d'),brushRadius = (bridge.width / 100) * 5,img = new Image();

if (brushRadius < 50) { brushRadius = 50 }

img.onload = function(){  
    bridgeCanvas.drawImage(img,bridge.width,bridge.height);
}
img.loc = 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/4273/';
img.filename = 'calgary-bridge-2013.jpg';
if (window.devicePixelRatio >= 2) {
    var nameParts = img.filename.split('.');
    img.src = img.loc + nameParts[0]+"-2x"+"."+nameParts[1];
} else {
    img.src = img.loc + img.filename;
}

function detectLeftButton(event) {
    if ('buttons' in event) {
        return event.buttons === 1;
    } else if ('which' in event) {
        return event.which === 1;
    } else {
        return event.button === 1;
    }
}

function getBrushPos(xRef,yRef) {
    var bridgeRect = bridge.getBoundingClientRect();
    return {
      x: Math.floor((xRef-bridgeRect.left)/(bridgeRect.right-bridgeRect.left)*bridge.width),y: Math.floor((yRef-bridgeRect.top)/(bridgeRect.bottom-bridgeRect.top)*bridge.height)
    };
}
      
function drawDot(mouseX,mouseY){
    bridgeCanvas.beginPath();
    bridgeCanvas.arc(mouseX,mouseY,brushRadius,2*Math.PI,true);
    bridgeCanvas.fillStyle = '#000';
    bridgeCanvas.globalCompositeOperation = "destination-out";
    bridgeCanvas.fill();
}

bridge.addEventListener("mousemove",function(e) {
    var brushPos = getBrushPos(e.clientX,e.clientY);
  var leftBut = detectLeftButton(e);
  if (leftBut == 1) {
        drawDot(brushPos.x,brushPos.y);
  }
},false);

bridge.addEventListener("touchmove",function(e) {
    e.preventDefault();
    var touch = e.targettouches[0];
    if (touch) {
    var brushPos = getBrushPos(touch.pageX,touch.pageY);
        drawDot(brushPos.x,brushPos.y);
    }
},false);

反应组件Fourth.js

import React from "react";
import styled from "styled-components";


function Fourth() {
  
  return (
    
    <Wrapper>
        <link rel="stylesheet" href="assets/css/main4.css" />
        <Meta name="viewport" content="width=device-width,initial-scale=1.0" />
     
         <section id="banner">
         
         <div class="inner">
             <p>scrape the picture..</p>
             <figure id="bridgeContainer">
            <canvas id="bridge" width="750" height="465"></canvas>
              <figcaption>Downtown Calgary in 2013 and 1943; mouse down or touch on photo to reveal</figcaption>
            </figure>
         </div>
         
         
        </section>  
    </Wrapper>
  );
}

const Wrapper = styled.div`
    /* omitted */
`;

export default Fourth;