當我按下按鈕添加一個部分時，它會添加一個部分，但它不會更新導航欄，它應該動態更新中殿欄，導航欄只顯示已經存在的部分，而不是我用 js 添加的部分，我沒有似乎注意到我做錯了什么，如果您有解決方案，請繼續
let sections = document.querySelectorAll("section");
let navList = document.getElementById("navbar__list");
const buildSecBtn = document.getElementById("newSection");
const main = document.querySelector("main");
/**
* End Global Variables
* Start Helper Functions
*
*/
let counter = 3;
const buildSection = () => {
counter
const newSec = ` <section id="section${counter}" data-nav="Section ${counter}">
<div >
<h2>Section ${counter}</h2>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Morbi fermentum metus faucibus lectus pharetra dapibus. Suspendisse potenti. Aenean aliquam elementum mi, ac euismod augue. Donec eget lacinia ex. Phasellus imperdiet porta orci eget mollis. Sed convallis sollicitudin mauris ac tincidunt. Donec bibendum, nulla eget bibendum consectetur, sem nisi aliquam leo, ut pulvinar quam nunc eu augue. Pellentesque maximus imperdiet elit a pharetra. Duis lectus mi, aliquam in mi quis, aliquam porttitor lacus. Morbi a tincidunt felis. Sed leo nunc, pharetra et elementum non, faucibus vitae elit. Integer nec libero venenatis libero ultricies molestie semper in tellus. Sed congue et odio sed euismod.</p>
<p>Aliquam a convallis justo. Vivamus venenatis, erat eget pulvinar gravida, ipsum lacus aliquet velit, vel luctus diam ipsum a diam. Cras eu tincidunt arcu, vitae rhoncus purus. Vestibulum fermentum consectetur porttitor. Suspendisse imperdiet porttitor tortor, eget elementum tortor mollis non.</p>
</div>
</section>`
main.insertAdjacentHTML("beforeend", newSec);
};
const buildNav = () => {
navList.innerHTML ="";
sections.forEach(section => {
const navItem = `<li><a data-nav="${section.id}" href="${section.id}">${section.dataset.nav}</a></li>`
navList.insertAdjacentHTML("beforeend",navItem)
})
}
buildNav();
buildSecBtn.addEventListener("click", () => {
buildSection();
buildNav();
})body {
background: rgb(136,203,171);
background: linear-gradient(0deg, rgba(136,203,171,1) 0%, rgba(0,13,60,1) 100%);
margin: 0;
font-family: 'Merriweather', serif;
color: #fff;
}
/* Typeography General*/
h1 {
font-family: 'Fira Sans', sans-serif;
font-size: 3em;
margin: 2em 1rem;
}
@media only screen and (min-width: 35em){
h1 {
font-size: 7em;
margin: 2em 4rem 1em;
}
}
h2 {
border-bottom: 1px solid #cc1;
font-family: 'Oxygen', Sans-Serif;
font-size: 3em;
color: #fff;
}
p {
line-height: 1.6em;
color: #eee;
}
/* ---- Layout Rules ---- */
main {
margin: 10vh 1em 10vh;
}
.main-hero {
min-height: 40vh;
padding-top: 3em;
}
section {
position: relative;
min-height: 80vh;
}
.navbar__menu ul {
padding-left: 0;
margin: 0;
text-align: right;
}
.navbar__menu li {
display: inline-block;
}
.navbar__menu .menu__link {
display: block;
padding: 1em;
font-weight: bold;
text-decoration: none;
color: #000;
}
.navbar__menu .menu__link:hover {
background: #333;
color: #fff;
transition: ease 0.3s all;
}
/* Header Styles */
.page__header {
background: #fff;
position: fixed;
top: 0;
width: 100%;
z-index: 5;
}
#newSection {
background-color: black;
position: sticky;
width: 5rem;
color: wheat;
}
.page__footer {
background: #000;
padding: 3em;
color: #fff;
}
.page__footer p{
color: #fff;
}
/* ---- Theme Rules ---- */
/* Landing Container Styles */
.landing__container {
padding: 1em;
text-align: left;
}
@media only screen and (min-width: 35em){
.landing__container {
max-width: 50em;
padding: 4em;
}
}
section:nth-of-type(even) .landing__container {
margin-right: 0;
margin-left: auto;
text-align: right;
}
section:nth-of-type(odd) .landing__container::before {
content: '';
background: rgba(255, 255, 255, 0.187);
position: absolute;
z-index: -5;
width: 20vh;
height: 20vh;
border-radius: 50%;
opacity: 0;
transition: ease 0.5s all;
}
section:nth-of-type(even) .landing__container::before {
content: '';
background: rgb(255,255,255);
background: linear-gradient(0deg, rgba(255,255,255,.1) 0%, rgba(255,255,255,.2) 100%);
position: absolute;
top: 3em;
right: 3em;
z-index: -5;
width: 10vh;
height: 10vh;
border-radius: 50%;
opacity: 0;
transition: ease 0.5s all;
}
section:nth-of-type(3n) .landing__container::after {
content: '';
background: rgb(255,255,255);
background: linear-gradient(0deg, rgba(255,255,255,.1) 0%, rgba(255,255,255,.2) 100%);
position: absolute;
right: 0;
bottom: 0;
z-index: -5;
width: 10vh;
height: 10vh;
border-radius: 50%;
opacity: 0;
transition: ease 0.5s all;
}
section:nth-of-type(3n 1) .landing__container::after {
content: '';
background: rgb(255,255,255);
background: linear-gradient(0deg, rgba(255,255,255,.1) 0%, rgba(255,255,255,.2) 100%);
position: absolute;
right: 20vw;
bottom: -5em;
z-index: -5;
width: 15vh;
height: 15vh;
border-radius: 50%;
opacity: 0;
transition: ease 0.5s all;
}
section.your-active-class {
background: rgb(0, 0, 0);
background: linear-gradient(0deg, rgba(0, 0, 0, 0.1) 0%, rgba(0, 0, 0, 0) 100%);
}
section.your-active-class .landing__container::before {
opacity: 1;
animation: rotate 4s linear 0s infinite forwards;
}
section.your-active-class .landing__container::after {
opacity: 1;
animation: rotate 5s linear 0s infinite forwards reverse;
}
@keyframes rotate {
from {
transform: rotate(0deg)
translate(-1em)
rotate(0deg);
}
to {
transform: rotate(360deg)
translate(-1em)
rotate(-360deg);
}
}<!DOCTYPE >
<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>Manipulating the DOM</title>
<!-- Load Google Fonts -->
<link href="https://fonts.googleapis.com/css?family=Fira Sans:900|Merriweather&display=swap" rel="stylesheet"> <!-- Load Styles -->
<link href="css/styles.css" rel="stylesheet">
<script src="/js/app.js" defer></script>
</head>
<body>
<!-- HTML Follows BEM naming conventions
IDs are only used for sections to connect menu achors to sections -->
<header class="page__header">
<nav class="navbar__menu">
<!-- Navigation starts as empty UL that will be populated with JS -->
<ul id="navbar__list"></ul>
</nav>
</header>
<main>
<header class="main__hero">
<button id="newSection"> add section </button>
<h1>Landing Page </h1>
</header>
<!-- Each Section has an ID (used for the anchor) and
a data attribute that will populate the li node.
Adding more sections will automatically populate nav.
The first section is set to active class by default -->
<section id="section1" data-nav="Section 1" class="your-active-class">
<div class="landing__container">
<h2>Section 1</h2>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Morbi fermentum metus faucibus lectus pharetra dapibus. Suspendisse potenti. Aenean aliquam elementum mi, ac euismod augue. Donec eget lacinia ex. Phasellus imperdiet porta orci eget mollis. Sed convallis sollicitudin mauris ac tincidunt. Donec bibendum, nulla eget bibendum consectetur, sem nisi aliquam leo, ut pulvinar quam nunc eu augue. Pellentesque maximus imperdiet elit a pharetra. Duis lectus mi, aliquam in mi quis, aliquam porttitor lacus. Morbi a tincidunt felis. Sed leo nunc, pharetra et elementum non, faucibus vitae elit. Integer nec libero venenatis libero ultricies molestie semper in tellus. Sed congue et odio sed euismod.</p>
<p>Aliquam a convallis justo. Vivamus venenatis, erat eget pulvinar gravida, ipsum lacus aliquet velit, vel luctus diam ipsum a diam. Cras eu tincidunt arcu, vitae rhoncus purus. Vestibulum fermentum consectetur porttitor. Suspendisse imperdiet porttitor tortor, eget elementum tortor mollis non.</p>
</div>
</section>
<section id="section2" data-nav="Section 2">
<div class="landing__container">
<h2>Section 2</h2>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Morbi fermentum metus faucibus lectus pharetra dapibus. Suspendisse potenti. Aenean aliquam elementum mi, ac euismod augue. Donec eget lacinia ex. Phasellus imperdiet porta orci eget mollis. Sed convallis sollicitudin mauris ac tincidunt. Donec bibendum, nulla eget bibendum consectetur, sem nisi aliquam leo, ut pulvinar quam nunc eu augue. Pellentesque maximus imperdiet elit a pharetra. Duis lectus mi, aliquam in mi quis, aliquam porttitor lacus. Morbi a tincidunt felis. Sed leo nunc, pharetra et elementum non, faucibus vitae elit. Integer nec libero venenatis libero ultricies molestie semper in tellus. Sed congue et odio sed euismod.</p>
<p>Aliquam a convallis justo. Vivamus venenatis, erat eget pulvinar gravida, ipsum lacus aliquet velit, vel luctus diam ipsum a diam. Cras eu tincidunt arcu, vitae rhoncus purus. Vestibulum fermentum consectetur porttitor. Suspendisse imperdiet porttitor tortor, eget elementum tortor mollis non.</p>
</div>
</section>
<section id="section3" data-nav="Section 3">
<div class="landing__container">
<h2>Section 3</h2>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Morbi fermentum metus faucibus lectus pharetra dapibus. Suspendisse potenti. Aenean aliquam elementum mi, ac euismod augue. Donec eget lacinia ex. Phasellus imperdiet porta orci eget mollis. Sed convallis sollicitudin mauris ac tincidunt. Donec bibendum, nulla eget bibendum consectetur, sem nisi aliquam leo, ut pulvinar quam nunc eu augue. Pellentesque maximus imperdiet elit a pharetra. Duis lectus mi, aliquam in mi quis, aliquam porttitor lacus. Morbi a tincidunt felis. Sed leo nunc, pharetra et elementum non, faucibus vitae elit. Integer nec libero venenatis libero ultricies molestie semper in tellus. Sed congue et odio sed euismod.</p>
<p>Aliquam a convallis justo. Vivamus venenatis, erat eget pulvinar gravida, ipsum lacus aliquet velit, vel luctus diam ipsum a diam. Cras eu tincidunt arcu, vitae rhoncus purus. Vestibulum fermentum consectetur porttitor. Suspendisse imperdiet porttitor tortor, eget elementum tortor mollis non.</p>
</div>
</section>
</main>
<footer class="page__footer">
<p>© Udacity</p>
</footer>
</body>
</html>uj5u.com熱心網友回復：
您的問題在于函式中的section變數buildNav，您必須再次搜索部分，否則您的變數section不會更新：
const buildNav = () => {
navList.innerHTML ="";
sections = document.querySelectorAll("section"); /* Reselect all sections */
sections.forEach(section => {
const navItem = `<li><a data-nav="${section.id}" href="${section.id}">${section.dataset.nav}</a></li>`
navList.insertAdjacentHTML("beforeend",navItem)
})
}
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標籤：javascript html css 数组 动态的
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