JS高级实现Tab栏切换，自定义内容与增加tab项

项目实现图

一，功能需求：

1. 点击 tab栏,可以切换效果.
2. 点击 + 号, 可以添加 tab 项和内容项.
3. 点击 x 号, 可以删除当前的tab项和内容项.
4. 双击tab项文字或者内容项文字可以修改里面的文字内容

二，案例准备

1. 获取到标题元素
2. 获取到内容元素
3. 获取到删除的小按钮 x号
4. 新建js文件,定义类,添加需要的属性方法(切换,删除,增加,修改)
5. 时刻注意this的指向问题

三，代码实现

html代码部分

    

        

            Js 面向对象 动态添加标签页
        
        
"tabsbox" id="tab">
            
            
"fisrstnav">
                

                    
"liactive">测试1"iconfont icon-guanbi">
                    
测试2"iconfont icon-guanbi">
                    
测试3"iconfont icon-guanbi">
                
                
"tabadd">
                    +
                
            

            
            
"tabscon">
                
"conactive">测试1
                
测试2
                
测试3
            
        
    

    

css代码部分

/* 字体图标部分 */
@font-face {font-family: "iconfont";
    src: url('./iconfont/iconfont.eot?t=1553960438096'); /* IE9 */
    src: url('./iconfont/iconfont.eot?t=1553960438096#iefix') format('embedded-opentype'), /* IE6-IE8 */
    url('data:application/x-font-woff2;charset=utf-8;base64,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') format('woff2'),
    url('./iconfont/iconfont.woff?t=1553960438096') format('woff'),
    url('./iconfont/iconfont.ttf?t=1553960438096') format('truetype'), /* chrome, firefox, opera, Safari, Android, iOS 4.2+ */
    url('./iconfont/iconfont.svg?t=1553960438096#iconfont') format('svg'); /* iOS 4.1- */
  }
  
  .iconfont {
    font-family: "iconfont" !important;
    font-size: 16px;
    font-style: normal;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }
  
  .icon-guanbi:before {
    content: "\e676";
  }

  /* css样式部分 */
* {
    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;
}

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;
    /* width: 100px; */
    top: 0;
    right: 0;
}

.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;
}

JS代码部分

var that;
class Tab {
    constructor(id) {
        that = this;
        //  获取元素
        this.main = document.querySelector(id);
        this.add = this.main.querySelector('.tabadd');
        // li的父元素
        this.ul = this.main.querySelector('.fisrstnav ul:first-child')
        // section的父元素
        this.fsection = this.main.querySelector('.tabscon');
        this.init();
    }
    // 初始化的类
    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;
        }
    }
    // 获取所有的li和section
    updateNode() {
        this.lis = this.main.querySelectorAll('li');
        this.sections = this.main.querySelectorAll('section');
        // 获取×号   因为动态添加元素 需要重新获取对应的元素
        this.remove = this.main.querySelectorAll('.icon-guanbi')
        this.spans = this.main.querySelectorAll('.fisrstnav li span:first-child');
    }
    // 切换
    toggleTab() {
        that.clearClass();
        this.className = 'liactive';
        that.sections[this.index].className = 'conactive';
    }
    // 清除所有li和section类
    clearClass() {
        for (var i = 0; i < this.lis.length; i++) {
            this.lis[i].className = '';
            this.sections[i].className = '';
        }
    }
    // 添加
    addTab() {
        that.clearClass();
        //   1.创建li元素和section元素
        var random = Math.random();
        var li = '
新选项卡
'
        var section = '
 测试卡' + random + '
';
        // 2.把这两个元素追加到对应的父元素里面
        that.ul.insertAdjacentHTML('beforeend', li);
        that.fsection.insertAdjacentHTML('beforeend', section);
        that.init();
    }
    // 删除
    removeTab(e) {
        e.stopPropagation();//阻止冒泡 防止触发li的切换事件
        var index = this.parentNode.index;
        // 根据索引号删除对应的li和section  remove()方法可以直接删除指定的元素
        that.lis[index].remove();
        that.sections[index].remove();
        that.init();
        //当我们删除了不是选定状态这个li之后  让他原来的li处于选定状态
        if (document.querySelector('.liactive')) return;
        //当我们删除了选定状态这个li之后  让他前一个li处于选定状态
        index--;
        // 手动调用我们的点击事件  不需要鼠标触发
        that.lis[index] && that.lis[index].click();
    }
    // 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 = '';
        var input = this.children[0];
        input.value = str;
        input.select();//文本框的内容处于选定状态
        input.onblur = function () {
            this.parentNode.innerHTML = this.value;
        }
        input.onkeyup = function (e) {
            if (e.keyCode === 13) {
                this.blur();//手动调用表单失去焦点事件  不需要鼠标离开操作
            }
        }
    }
}
new Tab('#tab');