题目1

<!DOCTYPE html>
<html>
<head>
    <title></title>
    <style>
        * {
            box-sizing: border-box;
        }
        ul,li{
            margin: 0;
            padding: 0;
            list-style: none;
        }
        .tab-ct .header:after{
            content: '';
            display: block;
            clear: both;
        }
        .tab-ct .header>li{
            width: 60px;
            height: 30px;
            line-height: 30px;
            border: 1px solid #ccc;
            border-right: none;
            float: left;
            text-align: center;
        }
        .tab-ct .header>li.active{
            background: #ccc;
        }
        .tab-ct .header>li:last-child{
            border-right: 1px solid #ccc;
        }
        .tab-ct .content>li{
            width: 180px;
            height: 100px;
            border: 1px solid #ccc;
            border-top: none;
            padding: 10px;
            display: none;
        }
        .tab-ct .content>li.active{
            display: block;
        }
    </style>
</head>
<body>
    <div class="tab-ct">
        <ul class="header">
            <li class="active">tab1</li>
            <li>tab2</li>
            <li>tab3</li>
        </ul>
        <ul class="content">
            <li class="active">wo</li>
            <li>yyz</li>
            <li>daqian</li>
        </ul>
    </div>

    <script>
        var tabs = document.querySelectorAll('.tab-ct .header>li')
        var panels = document.querySelectorAll('.tab-ct .content>li')

        tabs.forEach(function(tab){
            tab.addEventListener('click', function(){
                tabs.forEach(function(node){
                    node.classList.remove('active')
                })
            
                this.classList.add('active')
                var index = [].indexOf.call(tabs, this)
            
                panels.forEach(function(node){
                    node.classList.remove('active')
                })
                panels[index].classList.add('active')
            })  
        })

    </script>
</body>
</html>

题目2

<!DOCTYPE html>
<html>
<head>
    <meta name="description" content="modal模态框">
    <meta charset="utf-8">
    <title>JS Bin</title>
    <style>
        
        .modal-dialog {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0,0,0,0.8);
        }
        .modal-dialog .bt{
            display: inline-block;
            padding: 3px 6px;
            border: 1px solid #ccc;
            border-radius: 3px;
            font-size: 14px;
        }
        .modal-dialog a{
            text-decoration: none;
            color: #333;
        }
        .modal-dialog .cover{
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background-color: #000;
            opacity: 0.4;
            z-index: 99;
        }
        .modal-dialog .modal-ct{
            position: fixed;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            -webkit-transform: translate(-50%, -50%);
            width: 400px;
            border-radius: 3px;
            border: 1px solid #ccc;
            background: #fff;
            z-index: 100;
        }
        .modal-dialog .modal-ct .header{
            position: relative;
            height: 36px;
            line-height: 36px;
            border-bottom: 1px solid #ccc;
        }
        .modal-dialog .modal-ct .header h3 {
            margin: 0;
            padding-left: 10px;
            font-size: 16px;
        }
        .modal-dialog .modal-ct .header .close{
            position: absolute;
            right: 10px;
            top: 10px;
            line-height: 1;
        }
        .modal-dialog .modal-ct .content{
            padding: 10px;
        }
        .modal-dialog .modal-ct .footer{
            padding: 10px;
            border-top: 1px solid #eee;
        }
        .modal-dialog .modal-ct .footer:after{
            content: '';
            display: table;
            clear: both;
        }
        .modal-dialog .modal-ct .footer .btn{
            float: right;
            margin-left: 10px;
        }
        .open{
            display: block;
        }
    </style>
</head>
<body>
    <div class="btn-group">
        <button id="btn-modal">点我1</button>
    </div>
    

    <div id="modal-1" class="modal-dialog">
        
        <div class="modal-ct">
            <div class="header">
                <h3>我是标题1</h3>
                <a class="close" href="#">x</a>
            </div>
            <div class="content">
                <p>我是内容1</p>
                <p>我是内容1</p>
            </div>
            <!-- <div class="footer">
                <a class="btn btn-confirm" href="#">确定</a>
                <a class="btn btn-cancel"  href="#">取消</a>              
            </div> -->
        </div>
    </div>

    <script>
        var btn = document.querySelector('#btn-modal'),
            modal = document.querySelector('#modal-1'),
            modalCt = document.querySelector('#modal-1 .modal-ct'),
            close = document.querySelector('#modal-1 .close');

        btn.addEventListener('click', function(){
            modal.classList.add('open')
        })
        close.addEventListener('click', function(){
            modal.classList.remove('open')
        })
        modal.addEventListener('click', function(){
            modal.classList.remove('open')
        })

        modalCt.addEventListener('click', function(e){
            e.stopPropagation()
        })
    </script>
</body>
</html>