JavaScript 面向对象TAB栏切换
功能要求：
- 点击 tab 栏，可以切换效果.
- 点击 + 号，可以添加 tab 项和内容项.
- 点击 x 号，可以删除当前的 tab 项和内容项.
- 双击tab项文字或者内容项文字，可以修改里面的文字内容.
代码实现：
Obj_TAB.html（复制并保存为html文件，打开即可见效果）：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<!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>面向对象 Tab</title>
<link rel="stylesheet" href="https://blog-static.cnblogs.com/files/jacklzx/Obj_TAB.css">
<link rel="stylesheet" href="https://blog-static.cnblogs.com/files/jacklzx/Obj_TAB_style.css">
</head>
<main>
<div class="tabsbox" id="tab">
<!-- tab 标签 -->
<nav class="firstnav">
<ul>
<li class="liactive"><span>测试1</span><span class="iconfont icon-guanbi"></span></li>
<li><span>测试2</span><span class="iconfont icon-guanbi"></span></li>
<li><span>测试3</span><span class="iconfont icon-guanbi"></span></li>
</ul>
<div class="tabadd">
<span>+</span>
</div>
</nav>
<!-- tab 内容 -->
<div class="tabscon">
<section class="conactive">测试1</section>
<section>测试2</section>
<section>测试3</section>
</div>
</div>
</main>
<script src="https://blog-static.cnblogs.com/files/jacklzx/Obj_TAB.js"></script>
</body>
</html>
Obj_TAB.css：
* {
margin: 0;
padding: 0;
}
ul li {
list-style: none;
}
main {
width: 960px;
height: 500px;
border-radius: 10px;
margin: 50px auto;
}
main h4 {
height: 100px;
line-height: 100px;
text-align: center;
}
.tabsbox {
width: 900px;
margin: 0 auto;
height: 400px;
border: 1px solid lightsalmon;
position: relative;
}
nav ul {
overflow: hidden;
}
nav ul li {
float: left;
width: 100px;
height: 50px;
line-height: 50px;
text-align: center;
border-right: 1px solid #ccc;
position: relative;
cursor: pointer;
}
nav ul li.liactive {
border-bottom: 2px solid #fff;
z-index: 9;
}
#tab input {
width: 80%;
height: 60%;
}
nav ul li span:last-child {
position: absolute;
user-select: none;
font-size: 12px;
top: -18px;
right: 0;
display: inline-block;
height: 20px;
}
.tabadd {
position: absolute;
top: 0;
right: 0;
cursor: pointer;
}
.tabadd span {
display: block;
width: 20px;
height: 20px;
line-height: 20px;
text-align: center;
border: 1px solid #ccc;
float: right;
margin: 10px;
user-select: none;
}
.tabscon {
width: 100%;
height: 300px;
position: absolute;
padding: 30px;
top: 50px;
left: 0px;
box-sizing: border-box;
border-top: 1px solid #ccc;
}
.tabscon section,
.tabscon section.conactive {
display: none;
width: 100%;
height: 100%;
}
.tabscon section.conactive {
display: block;
}
Obj_TAB.js：
var that;
class Tab {
constructor(id) {
that = this;
this.main = document.querySelector(id);
// this.lis = this.main.querySelectorAll('li');
// this.sections = this.main.querySelectorAll('section');
this.add = this.main.querySelector('.tabadd');
// this.remove = this.main.querySelectorAll('.icon-guanbi');
this.ul = this.main.querySelector('.firstnav ul:first-child');
this.fsection = this.main.querySelector('.tabscon');
this.init();
}
init() {
this.updateNode();
this.add.onclick = this.addTab;
for (var i = 0; i < this.lis.length; i++) {
this.lis[i].index = i;
this.lis[i].onclick = this.toggleTab;
this.remove[i].onclick = this.removeTab;
this.spans[i].ondblclick = this.editTab;
this.sections[i].ondblclick = this.editTab;
}
}
// 获取所有li和section
updateNode() {
this.lis = this.main.querySelectorAll('li');
this.sections = this.main.querySelectorAll('section');
this.remove = this.main.querySelectorAll('.icon-guanbi');
this.spans = this.main.querySelectorAll('.firstnav li span:first-child');
}
// 1.切换
toggleTab() {
that.clearClass();
this.className = 'liactive';
that.sections[this.index].className = 'conactive';
}
clearClass() {
for (var i = 0; i < this.lis.length; i++) {
this.lis[i].className = '';
this.sections[i].className = '';
}
}
// 2. 添加
addTab() {
that.clearClass();
var random = Math.random();
// 创建
var li = '<li class="liactive"><span>测试1</span><span class="iconfont icon-guanbi"></span></li>';
var section = '<section class="conactive">' + random + '</section>';
// 追加
that.ul.insertAdjacentHTML('beforeend', li);
that.fsection.insertAdjacentHTML('beforeend', section);
that.init();
}
// 3.删除
removeTab(e) {
e.stopPropagation(); // 阻止冒泡
var index = this.parentNode.index;
// console.log(index);
that.lis[index].remove();
that.sections[index].remove();
that.init();
// 删除后如果有li处于选定状态，就不要切换选项卡，否则切换到前一个选项卡
if (document.querySelector('.liactive')) return;
index--;
// 手动调用点击事件
that.lis[index] && that.lis[index].click();
}
// 4.修改
editTab() {
var str = this.innerHTML;
// 双击禁止选定文字
window.getSelection ? window.getSelection().removeAllRanges() : document.selection.empty();
this.innerHTML = '<input type="text" />';
var input = this.children[0];
input.value = str;
input.select(); // 默认选中
input.onblur = function() {
this.parentNode.innerHTML = this.value;
}
// 按回车也能幅值
input.onkeyup = function(e) {
if (e.keyCode == 13) {
this.blur();
}
}
}
}
new Tab('#tab');
