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scroll.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
body {
margin: 0;
padding: 0;
}
.container {
width: 100%;
height: 100%;
position: fixed;
}
.wrapper {
position: absolute;
left: 0;
top: 0;
width: 10%;
height: 100%;
background: #fff;
border-right: 1px solid #ccc;
}
.box1 {
position: absolute;
right: 0;
top: 0;
width: 90%;
height: 100%;
background: #eee;
overflow-y: auto;
}
.section {
font-size: 15px;
color: #333;
width: 100%;
height: 60px;
line-height: 60px;
text-align: center;
cursor: pointer;
background: #fff;
/* border-right: 1px solid #ccc; */
transition: all .5s;
}
.section:hover {
color: #04be02;
background: #eee;
}
.list {
width: 100%;
height: 500px;
}
.tit {
margin: 5px 0;
padding: 0;
width: 100%;
height: 50px;
line-height: 50px;
padding-left: 10px;
font-size: 15px;
background: #feefdf;
color: #333;
}
.active {
color: #04be02;
background: #eee;
/* border-right:1px solid #eee; */
}
</style>
</head>
<body>
<div class="container">
<div class="wrapper">
<div class="section">分类1</div>
<div class="section">分类2</div>
<div class="section">分类3</div>
<div class="section">分类4</div>
</div>
<div class="box1">
<div class="list">
<p class="tit">分类1</p>
<div class="list_cont">
内容
</div>
</div>
<div class="list">
<p class="tit">分类2</p>
<div class="list_cont">
内容
</div>
</div>
<div class="list">
<p class="tit">分类3</p>
<div class="list_cont">
内容
</div>
</div>
<div class="list">
<p class="tit">分类4</p>
<div class="list_cont">
内容
</div>
</div>
</div>
</div>
</body>
<script>
let $ = (obj) => {
if (typeof (obj) != 'number') {
if (obj.indexOf('#') != -1) {
return document.querySelector(obj);
} else if (obj.indexOf('.') != -1) {
let dom = document.querySelectorAll(obj);
let len = dom.length;
if (len === 1 && len) {
return dom[0];
} else {
return dom;
};
} else {
console.log(new Error('请检查是否存在该id或class'));
return undefined;
};
} else {
console.log(new Error('请传入id或class'));
return undefined;
};
};
scrolls(['.box1', '.section', '.list', 200, 'section', 'active', 2]);
function scrolls(obj) {
$(obj[0]).onscroll = function () {
var t = this.scrollTop; //获取滚动条距离顶部的位置
var len = $(obj[2]).length; //获取nav个数
for (var i = 0; i < len; i++) {
if (t >= $(obj[2])[i].offsetTop - obj[3]) {
// 判断顶部距离大于等于当前div的上边距
if (t < (to_scroll(i, true)) + obj[3] || t > (to_scroll(i, true)) + obj[3]) {
// 判断顶部距离小于div的高度乘于当前div的下标
for (var k = 0; k < len; k++) {
$(obj[1])[k].className = obj[4];
// 恢复初始值
};
$(obj[1])[i].classList.add(obj[5]);
// 添加样式
};
};
};
}; //滚动实时监听滚动条位置
(function () {
var len = $(obj[1]).length;
for (var i = 0; i < len; i++) {
$(obj[1])[i].className = obj[4];
nav_tab(i);
};
function nav_tab(i) {
$(obj[1])[i].addEventListener('click', function () {
to_scroll(i);
for (var j = 0; j < len; j++) {
$(obj[1])[j].className = obj[4]; // 恢复初始值
};
this.classList.add(obj[5]); // 添加样式
}, false);
};
// 点击侧边改变滚动条位置
})();
(function () {
var index = obj[6] || 0;
if (index) {
if (!(index - 1)) {
$(obj[0]).scrollTop = 1;
// 避免设置第一个默认显示的时候不会自动选中
} else {
to_scroll(index - 1);
};
} else {
$(obj[0]).scrollTop = 1;
};
})(); // 初始显示
function to_scroll(i, flag) {
var num = 0;
for (var l = 0; l < i; l++) {
num += $(obj[2])[l].offsetHeight;
};
if (!flag) {
$(obj[0]).scrollTop = num; //设置滚动条
} else {
return num; //返回滚动条的位置
};
}; //设置滚动条位置(滚动条的位置是obj[2]的下标（第几个）之间的总和)
};
</script>
</html>