這裡的重點是將div的位置設為滑鼠作為附加效果，它應該有一個半徑，但它不起作用：
let inner_circle = document.getElementById("inner_circle");
window.addEventListener("mousemove", function(mouse) {
inner_circle.style.transform = `translate(${mouse.clientX}px, ${mouse.clientY}px)`; // sets the position of the inner circle to the mouse
});
#inner_circle{
margin-left: -3px;
margin-top: -3px;
position: fixed;
top: 0;
left: 0;
border: 1px solid #703be7;
border-radius: 50%; //<- doesn't work
font-size: 1px;
background-color: #703be7;
width: 6px;
width: 6px;
z-index: 1000001;
pointer-events: none;
}
<div id="inner_circle"></div>
更改你的 CSS。寬度：6 像素；寬度：6 像素；寬度：6px；高度：6px;
let inner_circle = document.getElementById("inner_circle"); window.addEventListener("mousemove", function(mouse) { inner_circle.style.transform = `translate(${mouse.clientX}px, ${mouse.clientY}px)`; // sets the position of the inner circle to the mouse });#inner_circle{ margin-left: -3px; margin-top: -3px; position: fixed; top: 0; left: 0; border: 1px solid #703be7; border-radius: 50%; //我假設你指的是這裡第二行的高度，這使得它成為一個問題
#inner_circle{ width: 6px; width: 6px; }所以只需將其更改為高度：
#inner_circle{ width: 6px; height: 6px; }