JavaScript 面向对象TAB栏切换 / 四六文摘

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');

JavaScript 面向对象TAB栏切换

功能要求：

代码实现：

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