Web Front-end
JS Tutorial
Debugging notes for tab switching special effects based on javascript_javascript skills
Debugging notes for tab switching special effects based on javascript_javascript skills
The example in this article analyzes the debugging notes of javascript to implement tab switching for your reference. The specific content is as follows
Create a navigation bar. When the navigation bar element is clicked, the content below will change accordingly, and the element will display a special style.
js source code:
//导航栏单击变换内容
function tabSwitch(_this,num) {
var tag = document.getElementById("nav9");
var number = tag.getElementsByTagName("a"); //获取导航栏元素个数(getElementsByTagName是返回元素素组)
var divNum = document.getElementsByClassName("eachDiv"); //获取导航元素对应的div个数
for(var i=0;i<number.length;i++){ //number是一个数组，这里应该用number.length显示它的长度5
number[i].className = " "; //清除所有导航栏元素的特殊样式
divNum[i].style.display = "none"; //其他所有div都隐藏
}
_this.className = "l_nav1_no1"; //给当前导航栏元素添加样式
var content = document.getElementById("l_no2_"+num); //当前导航栏元素对应的div
content.style.display = "block"; //显示当前导航栏元素对应的div部分
}
HTML code:
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
<script type="text/javascript" src="../MyJS/hao123.js"></script>
<style type="text/css">
.l_nav1 {
height: 30px;
padding-top: 8px;
}
.l_nav1 a{
color: #3C3C3C;
text-decoration: none;
padding: 8px;
}
.l_nav1 a:hover,#l_nav1 a:active {
color: green;
text-decoration: underline;
}
.l_nav1 .l_nav1_no1 { /*“头条”*/
color: green;
text-decoration: none;
border-top: solid 1px green;
}
.l_no2 {
background-color: #ffffff;
border: solid 1px #E0E0E0;
height: 282px;
width: 276px;
overflow: scroll; /*当元素内容太大而超出规定区域时，内容会被修剪，但是浏览器会显示滚动条以便查看其余的内容。。*/
}
.l_no2 ul{ /*列表部分*/
padding-left: 0px;
line-height: 25px;
font-size: 14px;;
}
.l_no2 ul li{
list-style: none;
}
.l_no2 ul a{
color: #3C3C3C;
text-decoration: none;
}
.l_no2 ul a:active,.l_no2 ul a:hover {
color: red;
text-decoration: underline;
}
</style>
</head>
<body>
<nav id="nav9" class="l_nav1">
<a href="#" onclick="tabSwitch(this,1)" class="l_nav1_no1">头条</a>
<a href="#" onclick="tabSwitch(this,2)">社会</a>
<a href="#" onclick="tabSwitch(this,3)">娱乐</a>
<a href="#" onclick="tabSwitch(this,4)">军事</a>
<a href="#" onclick="tabSwitch(this,5)">体育</a>
</nav>
<div class="l_no2">
<div id="l_no2_1" class="eachDiv" style="display: block"> <!--默认为该div显示-->
<img src="../images/hao123/25.jpg" width="274px">
<ul>
<li><strong style="color: #6C6C6C">·</strong><a href="#">县领导找不着住建局长 对其通报批评</a></li>
<li><strong style="color: #6C6C6C">·</strong><a href="#">女子亲热感觉"卡" 检查现"异形"侵体</a></li>
<li><strong style="color: #6C6C6C">·</strong><a href="#">大妈被女童玩具小车撞到 叫来救护车</a></li>
<li><strong style="color: #6C6C6C">·</strong><a href="#">六旬老人遇老相识 30元发生关系被抓</a></li>
</ul>
</div>
<div id="l_no2_2" class="eachDiv" style="display: none">
<img src="../images/hao123/25.2.jpg" width="274px">
<ul>
<li><strong style="color: #6C6C6C">·</strong><a href="#">妻子产子收1200枚鸡蛋 丈夫1天卖光</a></li>
<li><strong style="color: #6C6C6C">·</strong><a href="#">母猪产下八名男婴 原因竟然如此凄凉</a></li>
<li><strong style="color: #6C6C6C">·</strong><a href="#">小夫妻宾馆开房 隔壁大叔全程看直播</a></li>
<li><strong style="color: #6C6C6C">·</strong><a href="#">老汉自造房车囚禁两妙龄女 边走边玩</a></li>
</ul>
</div>
<div id="l_no2_3" class="eachDiv" style="display: none">
<img src="../images/hao123/25.3.jpg" width="274px">
<ul>
<li><strong style="color: #6C6C6C">·</strong><a href="#">金星追问陈坤儿子生母 他还真招认了</a></li>
<li><strong style="color: #6C6C6C">·</strong><a href="#">台湾女星“酒后乱性” 婆婆当场傻眼</a></li>
<li><strong style="color: #6C6C6C">·</strong><a href="#">车晓和前夫离婚后 如此评价这段经历</a></li>
<li><strong style="color: #6C6C6C">·</strong><a href="#">韩国卖淫女星身份遭曝光！G.NA在列</a></li>
</ul>
</div>
<div id="l_no2_4" class="eachDiv" style="display: none">
<img src="../images/hao123/25.4.jpg" width="274px">
<ul>
<li><strong style="color: #6C6C6C">·</strong><a href="#">朝鲜愤然击落美军侦察机 美为何认怂</a></li>
<li><strong style="color: #6C6C6C">·</strong><a href="#">多数人不知道 中国已经买过四艘航母</a></li>
<li><strong style="color: #6C6C6C">·</strong><a href="#">中国两栖登陆王牌协同作战 场面壮观</a></li>
<li><strong style="color: #6C6C6C">·</strong><a href="#">朝鲜惊人作战计划曝光：突袭朴槿惠</a></li>
</ul>
</div>
<div id="l_no2_5" class="eachDiv" style="display: none">
<img src="../images/hao123/25.5.jpg" width="274px">
<ul>
<li><strong style="color: #6C6C6C">·</strong><a href="#">末战胜卡塔尔不够 国足期待2队犯错</a></li>
<li><strong style="color: #6C6C6C">·</strong><a href="#">赛中产子属误传 产妇是辽宁女排队员</a></li>
<li><strong style="color: #6C6C6C">·</strong><a href="#">球迷50万赌国足赢4球以上 血本无归</a></li>
<li><strong style="color: #6C6C6C">·</strong><a href="#">高洪波：国足只能算一般队 比较命苦</a></li>
</ul>
</div>
</div>
</body>
</html>
Rendering:
Debug notes:
1. Mistake 1:
var number = tag.getElementsByTagName("a").length;
(1) Error report:
(2) Explanation and correction:
**getElementsByTagName() returns the element group. If you take its length, number is just a number, so number[i].className = " "; will report an error. **
Correction:
var number = tag.getElementsByTagName("a");
2. Mistake 2:
for(var i=0;i<number;i++){
number[i].className = " "; //清除所有导航栏元素的特殊样式
divNum[i].style.display = "none"; //其他所有div都隐藏
}The number here should be a number, representing the number of elements in a. From error 1, we can know that to get the length of number, it should be changed to:
for(var i=0;i<number.length;i++){ //number是一个数组
number[i].className = " "; //清除所有导航栏元素的特殊样式
divNum[i].style.display = "none"; //其他所有div都隐藏
}
The above is the entire content of this article, I hope it will be helpful to everyone’s study.
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1386
52
How to implement an online speech recognition system using WebSocket and JavaScript
Dec 17, 2023 pm 02:54 PM
How to use WebSocket and JavaScript to implement an online speech recognition system Introduction: With the continuous development of technology, speech recognition technology has become an important part of the field of artificial intelligence. The online speech recognition system based on WebSocket and JavaScript has the characteristics of low latency, real-time and cross-platform, and has become a widely used solution. This article will introduce how to use WebSocket and JavaScript to implement an online speech recognition system.
WebSocket and JavaScript: key technologies for implementing real-time monitoring systems
Dec 17, 2023 pm 05:30 PM
WebSocket and JavaScript: Key technologies for realizing real-time monitoring systems Introduction: With the rapid development of Internet technology, real-time monitoring systems have been widely used in various fields. One of the key technologies to achieve real-time monitoring is the combination of WebSocket and JavaScript. This article will introduce the application of WebSocket and JavaScript in real-time monitoring systems, give code examples, and explain their implementation principles in detail. 1. WebSocket technology
How to use JavaScript and WebSocket to implement a real-time online ordering system
Dec 17, 2023 pm 12:09 PM
Introduction to how to use JavaScript and WebSocket to implement a real-time online ordering system: With the popularity of the Internet and the advancement of technology, more and more restaurants have begun to provide online ordering services. In order to implement a real-time online ordering system, we can use JavaScript and WebSocket technology. WebSocket is a full-duplex communication protocol based on the TCP protocol, which can realize real-time two-way communication between the client and the server. In the real-time online ordering system, when the user selects dishes and places an order
How to implement an online reservation system using WebSocket and JavaScript
Dec 17, 2023 am 09:39 AM
How to use WebSocket and JavaScript to implement an online reservation system. In today's digital era, more and more businesses and services need to provide online reservation functions. It is crucial to implement an efficient and real-time online reservation system. This article will introduce how to use WebSocket and JavaScript to implement an online reservation system, and provide specific code examples. 1. What is WebSocket? WebSocket is a full-duplex method on a single TCP connection.
JavaScript and WebSocket: Building an efficient real-time weather forecasting system
Dec 17, 2023 pm 05:13 PM
JavaScript and WebSocket: Building an efficient real-time weather forecast system Introduction: Today, the accuracy of weather forecasts is of great significance to daily life and decision-making. As technology develops, we can provide more accurate and reliable weather forecasts by obtaining weather data in real time. In this article, we will learn how to use JavaScript and WebSocket technology to build an efficient real-time weather forecast system. This article will demonstrate the implementation process through specific code examples. We
Simple JavaScript Tutorial: How to Get HTTP Status Code
Jan 05, 2024 pm 06:08 PM
JavaScript tutorial: How to get HTTP status code, specific code examples are required. Preface: In web development, data interaction with the server is often involved. When communicating with the server, we often need to obtain the returned HTTP status code to determine whether the operation is successful, and perform corresponding processing based on different status codes. This article will teach you how to use JavaScript to obtain HTTP status codes and provide some practical code examples. Using XMLHttpRequest
How to use insertBefore in javascript
Nov 24, 2023 am 11:56 AM
Usage: In JavaScript, the insertBefore() method is used to insert a new node in the DOM tree. This method requires two parameters: the new node to be inserted and the reference node (that is, the node where the new node will be inserted).
JavaScript and WebSocket: Building an efficient real-time image processing system
Dec 17, 2023 am 08:41 AM
JavaScript is a programming language widely used in web development, while WebSocket is a network protocol used for real-time communication. Combining the powerful functions of the two, we can create an efficient real-time image processing system. This article will introduce how to implement this system using JavaScript and WebSocket, and provide specific code examples. First, we need to clarify the requirements and goals of the real-time image processing system. Suppose we have a camera device that can collect real-time image data
