我正在尝试用JavaScript创建一个可拖动的滑块。但它对我的不起作用。我在W3学校的内置HTML上尝试过同样的JS代码，效果很好。我不明白我的代码出了什么问题！关于我关心的问题，我几乎什么都试过了。但仍然面临同样的问题
let lists = document.querySelector("#lists");
let cursorRunningPosition;
let cursorStartingPosition;
let cursorMoved;
let scrollLeft;
let isdown = false;
lists.addEventListener("mousedown", (e) => {
isdown = true;
cursorStartingPosition = e.pageX;
lists.style.cursor = "grabbing";
if (isdown === true) {
scrollLeft = lists.scrollLeft;
}
})
lists.addEventListener("mouseup", (f) => {
isdown = false;
lists.style.cursor = "auto";
})
lists.addEventListener("mouseleave", (f) => {
isdown = false;
lists.style.cursor = "auto";
})
lists.addEventListener("mousemove", (g) => {
g.preventDefault();
if (isdown === true) {
cursorRunningPosition = g.pageX;
cursorMoved = cursorRunningPosition - cursorStartingPosition;
lists.scrollLeft = scrollLeft - cursorMoved;
}
})li{
list-style-type: none;
background-color: lightcoral;
padding: 5px 10px 5px 10px;
}
*{
margin: 0;
padding: 0;
box-sizing: border-box;
overflow: hidden;
}
#lists {
display: flex;
width: 157%;
justify-content: space-between;
}
.container {
width: 100%;
background-color: yellow;
height: 37vh;
overflow: hidden;
margin-left: 20%;
}<!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">
<link rel="stylesheet" href="style.css">
<title>Test file</title>
</head>
<body>
<div class="container">
<div id="lists">
<li class="li-list">Home</li>
<li class="li-list">About</li>
<li class="li-list">Contact</li>
<li class="li-list">Portfolio</li>
<li class="li-list">Testimonials</li>
</div>
</div>
<script src="app.js"></script>
</body>
</html>const lists = document.querySelector(".container");
let cursorRunningPosition;
let cursorStartingPosition;
let cursorMoved;
let scrollLeft;
let isdown = false;
lists.addEventListener("mousedown", (e) => {
isdown = true;
cursorStartingPosition = e.pageX;
lists.style.cursor = "grabbing";
if (isdown === true) {
scrollLeft = lists.scrollLeft;
}
})
lists.addEventListener("mouseup", (f) => {
isdown = false;
lists.style.cursor = "auto";
})
lists.addEventListener("mouseleave", (f) => {
isdown = false;
lists.style.cursor = "auto";
})
lists.addEventListener("mousemove", (g) => {
g.preventDefault();
if (isdown == true) {
cursorRunningPosition = g.pageX;
cursorMoved = cursorRunningPosition - cursorStartingPosition;
lists.scrollLeft = scrollLeft - cursorMoved;
}
})li{
list-style-type: none;
background-color: lightcoral;
padding: 5px 10px 5px 10px;
}
*{
margin: 0;
padding: 0;
box-sizing: border-box;
overflow: hidden;
}
#lists {
display: flex;
width: 157%;
justify-content: space-between;
}
.container {
width: 80%;
background-color: yellow;
height: 37vh;
margin-left: 20%;
overflow: auto;
}
.container::-webkit-scrollbar {
display: none;
}
/* Hide scrollbar for IE, Edge and Firefox */
.container {
-ms-overflow-style: none; /* IE and Edge */
scrollbar-width: none; /* Firefox */
}<!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">
<link rel="stylesheet" href="style.css">
<title>Test file</title>
</head>
<body>
<div class="container">
<div id="lists">
<li class="li-list">Home</li>
<li class="li-list">About</li>
<li class="li-list">Contact</li>
<li class="li-list">Portfolio</li>
<li class="li-list">Testimonials</li>
</div>
</div>
<script src="app.js"></script>
</body>
</html>我对此进行了研究，const比var或let以及容器的css工作得更好：
.container {
width: 80%;
background-color: yellow;
height: 37vh;
margin-left: 20%;
overflow: auto;
}
width为80%，margin left为20%，以及启用滚动的"overflow：auto"。然后删除滚动条：
.container::-webkit-scrollbar {
display: none;
}
/* Hide scrollbar for IE, Edge and Firefox */
.container {
-ms-overflow-style: none; /* IE and Edge */
scrollbar-width: none; /* Firefox */
}
PS:单击"扩展片段"可以更好地查看它！