固定导航栏和可编辑表格

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        body, ul, li {
            margin: 0;
            padding: 0;
        }
        ul {
            list-style: none;
        }
        a {
            text-decoration: none;
        }
        a:hover {
            text-decoration: underline;
        }
        .container {
            width: 600px;
            margin: 20px auto;
            background-color: #fbfbfb;
        }
        nav > div {
            height: 90px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            border: 1px solid #ccc;
            padding: 0 20px;
        }
        nav > ul {
            height: 30px;
            width: 580px;
            background-color: #fbfbfb;
            border-bottom: 1px solid #888888;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 5px 10px;
        }
        main {
            height: 100vh;
            border: 1px solid #ccc;
        }
        main > table {
            border: 1px solid #ccc;
            margin: 15px auto;
            background-color: #fff;
            width: 95%;
        }
        main > table thead th:first-of-type {
            width: 10%;
        }
        main > table thead th:first-of-type ~ * {
            width: 45%;
        }
        main > table tbody input {
            width: 95%;
            margin: 0 1px;
        }
        main > table tr {
            border: 1px solid #ccc;
            background-color: aliceblue;
        }
        footer {
            height: 60px;
            line-height: 60px;
            border: 1px solid #ccc;
            text-align: center;
        }
    </style>
</head>
<body>
<header class="container">
    <nav>
        <div id="nav-top">
            <div>Logo</div>
            <div></div>
            <div></div>
        </div>
        <ul id="nav-menu">
            <li><a href="" title="">导航1</a></li>
            <li><a href="" title="">导航2</a></li>
            <li><a href="" title="">导航3</a></li>
            <li><a href="" title="">导航4</a></li>
            <li><a href="" title="">导航5</a></li>
        </ul>
    </nav>
</header>
<main class="container ">
    <table>
        <thead>
        <tr>
            <th>ID</th>
            <th>name</th>
            <th>value</th>
        </tr>
        </thead>
        <tbody>
        <tr>
            <td>1</td>
            <td>text name</td>
            <td>text value</td>
        </tr>
        <tr>
            <td>2</td>
            <td>text name2</td>
            <td>text value2</td>
        </tr>
        </tbody>
    </table>
</main>
<footer class="container">
    @copy 2021
</footer>
<script>
    // 固定导航
    var navTop = document.getElementById('nav-top'),
        navMenu = document.getElementById('nav-menu');
    window.onscroll = function () {
        if (document.documentElement.scrollTop > navTop.offsetHeight + navTop.offsetTop) {
            navMenu.style.cssText = 'position:fixed;top:0';
        } else {
            navMenu.style.cssText = 'position:static';
        }
    }
    // 可编辑表格
    // var tds = document.getElementsByTagName('table')[0].getElementsByTagName('td');
    // [...tds].forEach(function (td){
    //     // ID字段不可编辑
    //     if (td !== [...td.parentNode.childNodes].filter(el => el.nodeType === 1).shift()) {
    //         td.onclick = function () {
    //             // 如果input框，直接获取焦点
    //             if ([...this.childNodes].some(el => el.nodeName === 'INPUT')) {
    //                 [...this.childNodes].filter(el => el.nodeName === 'INPUT').shift().focus();
    //             } else {
    //                 var eInput = document.createElement('input');
    //                 eInput.type = 'text';
    //                 eInput.value = this.textContent;
    //                 this.innerHTML = '';
    //                 this.appendChild(eInput);
    //                 eInput.focus();
    //                 // 失去焦点时
    //                 eInput.onblur = function () {
    //                     this.parentNode.innerHTML = this.value;
    //                 }
    //             }
    //         }
    //     }
    // });
    var tBody = document.getElementsByTagName('table')[0].getElementsByTagName('tbody')[0];
    tBody.addEventListener('click', function (ev) {
        var event = ev || window.event;
        event.stopPropagation ? event.stopPropagation() : (event.cancelBubble = true);
        // ID字段不可编辑
        if ([...event.target.parentNode.childNodes].filter(el => el.nodeType === 1).shift() !== event.target) {
            // 如果input框，直接获取焦点
            if ([...event.target.childNodes].some(el => el.nodeName === 'INPUT')) {
                [...event.target.childNodes].filter(el => el.nodeName === 'INPUT').shift().focus();
            } else {
                var eInput = document.createElement('input');
                eInput.type = 'text';
                eInput.value = event.target.textContent;
                event.target.innerHTML = '';
                event.target.appendChild(eInput);
                eInput.focus();
                // 失去焦点时
                eInput.onblur = function () {
                    this.parentNode.innerHTML = this.value;
                }
            }
        }
    });
</script>
</body>
</html>