let stopDrag = false;
        const mouse = {}
        document.addEventListener('mousemove', (e) => {
            mouse.x = e.clientX;
            mouse.y = e.clientY;
        })
        document.getElementsByClassName('scrollbar')[0].addEventListener('mousedown', startDrag)
        document.getElementsByClassName('drag')[0].addEventListener('mousedown',startDrag)
        document.addEventListener('mouseup', () => {
            stopDrag = true;
        })
        function startDrag() {
            stopDrag = false;
            let interval = setInterval(() => {
                if(mouse.y+180 > 495) {
                    document.getElementsByClassName('drag')[0].style.top ="495px";
                } else 
                if(mouse.y+180 <217) {
                    document.getElementsByClassName('drag')[0].style.top ="0px";
                }
                else
                {
                    document.getElementsByClassName('drag')[0].style.top = mouse.y+(180 + ((Number(document.getElementsByClassName('drag')[0].style.top.split("p")[0]) -760)/3.5));
                }
                document.getElementsByClassName('window')[0].style.bottom = (Number(document.getElementsByClassName('drag')[0].style.top.split("p")[0]) -760) + "px"
                if(stopDrag) {
                    clearInterval(interval)
                }
            })
        }

.container {
   position: fixed;
   top: 0;
   left: 0;
   width: 100%;
   height: 100%;
   z-index: 500;
}

.main-content {
   display: flex;
   width: 100%;
   height: 100%;
   overflow: auto;
   margin: auto;
}

.window {
   /*height: 16vw;
   width: 27vw;*/
   display: flex;
   height: 550px;
   width: 800px;
   position: absolute;
   top: 50%;
   left: 50%;
   border: solid blue 5px;
   background-color: black;
   margin: auto;
   overflow: hidden;
}
.scrollbar {
    height: 100%;
    width: 2%;
    position: fixed;
    top: 0%;
    right: 10%;
    z-index: 3;
    background: white;
}
.scrollbar .drag {
    background: darkgray;
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100%;
    height: 10%;
    
}
.scrollbar .drag:hover {
    background: grey;
}

<div class="container">
        <div class="main-content">
          <div class="window" id="window1" style="transform: translate(-10%, -90%);">
            <div class="header" id="window-header">
              <img src="https://picsum.photos/800/550">
              <div class="scrollbar">
                <div class="drag" draggable = false></div>
              </div>
              <p class="title">navigation</p>
            </div>
          </div>
        </div>
       </div>

EXPLANATION

基本上，我使用HTML和CSS制作了一个滚动条，并将其放置在图像的最右侧

希望HTML和CSS能够理解 现在，让我们来看看JavaScript部分

首先，我们映射鼠标坐标

const mouse = {}
document.addEventListener('mousemove', (e) => {
            mouse.x = e.clientX;
            mouse.y = e.clientY;
        })

我们创建调用函数或更改stop drag变量的事件监听器

let stopDrag = false;
document.getElementsByClassName('scrollbar')[0].addEventListener('mousedown', startDrag)
        document.getElementsByClassName('drag')[0].addEventListener('mousedown',startDrag)
        document.addEventListener('mouseup', () => {
            stopDrag = true;
        })

然后我们创建startDrag()函数

function startDrag() {
            stopDrag = false;
            let interval = setInterval(() => {
                if(mouse.y+180 > 495) {
                    document.getElementsByClassName('drag')[0].style.top ="495px";
                } else 
                if(mouse.y+180 <217) {
                    document.getElementsByClassName('drag')[0].style.top ="0px";
                }
                else
                {
                    document.getElementsByClassName('drag')[0].style.top = mouse.y+(180 + ((Number(document.getElementsByClassName('drag')[0].style.top.split("p")[0]) -760)/3.5));
                }
                document.getElementsByClassName('window')[0].style.bottom = (Number(document.getElementsByClassName('drag')[0].style.top.split("p")[0]) -760) + "px"
                if(stopDrag) {
                    clearInterval(interval)
                }
            })
        }

在这个函数中，首先我们将stopdrag设置为false，因为用户当前正在拖动滚动条 然后我们设置一个间隔循环代码 根据坐标，mouse.y大部分是试错 我们检查它是否在限制范围内，如果是，我们重新定位 然后我们在拖动时更改滚动条的顶部位置（计算是试错的） 然后我们更改window类div的底部位置来重新定位window类div（因为图像本身无法重新定位；如果您不希望整个window类div移动，可以在其上创建另一个容器）以查看它 如果拖动停止，我们清除间隔