Home Web Front-end JS Tutorial Jquery下attr和removeAttr的使用方法_jquery

Jquery下attr和removeAttr的使用方法_jquery

May 16, 2016 pm 06:13 PM

下面我们来具体看一下attr的用法:
一、attr(name):取得第一个匹配元素的属性值。通过这个方法可以方便地从第一个匹配元素中获取一个属性的值。如果元素没有相应属性,则返回 undefined 。其中name为string.下面我用一个img元素演示一下这种用法:

复制代码 代码如下:

//html文件中 Jquery下attr和removeAttr的使用方法_jquery
//我们可以用attr获得img元素的src属性,具体用法如下:
$(function(){
var imgSrc = $("img").attr('src');
alert(imgSrc); //显示 a.gif
})

二、attr(key,value):为所有匹配的元素设置一个属性值。key为string属性名,value为object属性值,用法演示:
复制代码 代码如下:

//html文件中 Jquery下attr和removeAttr的使用方法_jquery
//使用此方法设置img的src属性
$(function(){
$("img").attr('src', 'a.gif'); //文件中显示 Jquery下attr和removeAttr的使用方法_jquery
})

三、attr(properties):这是一种在所有匹配元素中批量设置很多属性的最佳方式。 注意,如果你要设置对象的class属性,你必须使用'className' 作为属性名。或者你可以直接使用.addClass( class ) 和 .removeClass( class ).
复制代码 代码如下:

//文件中 Jquery下attr和removeAttr的使用方法_jquery
$(function(){
$("img").attr({src:'a.gif', title:'this is a image', className: 'filter'});
})
// 显示为Jquery下attr和removeAttr的使用方法_jquery

四、attr(key, fn):为所有匹配的元素设置一个计算的属性值。不提供值,而是提供一个函数,由这个函数计算的值作为属性值。
复制代码 代码如下:

//文件中 Jquery下attr和removeAttr的使用方法_jquery
$(function(){
$("img").attr('title', function(){ return this.src }); //显示 Jquery下attr和removeAttr的使用方法_jquery
})

以上介绍的是attr的一些用法,下面是removeAttr的用法 remove故明思意就是移除的意思,从每一个匹配的元素中删除一个属性。它的具体用法就是:
复制代码 代码如下:

//文档中 Jquery下attr和removeAttr的使用方法_jquery
$(function(){
$("img").removeAttr('title'); //显示 Jquery下attr和removeAttr的使用方法_jquery
})

以上介绍了attr和removeAttr的基本用法,在实际的工作中还会遇到一些更为复杂的应用,这就需要我们掌握基本用法的同时,多多总结和尝试其他用法。
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
2 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Best Graphic Settings
2 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. How to Fix Audio if You Can't Hear Anyone
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Replace String Characters in JavaScript Replace String Characters in JavaScript Mar 11, 2025 am 12:07 AM

Detailed explanation of JavaScript string replacement method and FAQ This article will explore two ways to replace string characters in JavaScript: internal JavaScript code and internal HTML for web pages. Replace string inside JavaScript code The most direct way is to use the replace() method: str = str.replace("find","replace"); This method replaces only the first match. To replace all matches, use a regular expression and add the global flag g: str = str.replace(/fi

Build Your Own AJAX Web Applications Build Your Own AJAX Web Applications Mar 09, 2025 am 12:11 AM

So here you are, ready to learn all about this thing called AJAX. But, what exactly is it? The term AJAX refers to a loose grouping of technologies that are used to create dynamic, interactive web content. The term AJAX, originally coined by Jesse J

10 jQuery Fun and Games Plugins 10 jQuery Fun and Games Plugins Mar 08, 2025 am 12:42 AM

10 fun jQuery game plugins to make your website more attractive and enhance user stickiness! While Flash is still the best software for developing casual web games, jQuery can also create surprising effects, and while not comparable to pure action Flash games, in some cases you can also have unexpected fun in your browser. jQuery tic toe game The "Hello world" of game programming now has a jQuery version. Source code jQuery Crazy Word Composition Game This is a fill-in-the-blank game, and it can produce some weird results due to not knowing the context of the word. Source code jQuery mine sweeping game

How do I create and publish my own JavaScript libraries? How do I create and publish my own JavaScript libraries? Mar 18, 2025 pm 03:12 PM

Article discusses creating, publishing, and maintaining JavaScript libraries, focusing on planning, development, testing, documentation, and promotion strategies.

jQuery Parallax Tutorial - Animated Header Background jQuery Parallax Tutorial - Animated Header Background Mar 08, 2025 am 12:39 AM

This tutorial demonstrates how to create a captivating parallax background effect using jQuery. We'll build a header banner with layered images that create a stunning visual depth. The updated plugin works with jQuery 1.6.4 and later. Download the

How do I optimize JavaScript code for performance in the browser? How do I optimize JavaScript code for performance in the browser? Mar 18, 2025 pm 03:14 PM

The article discusses strategies for optimizing JavaScript performance in browsers, focusing on reducing execution time and minimizing impact on page load speed.

Getting Started With Matter.js: Introduction Getting Started With Matter.js: Introduction Mar 08, 2025 am 12:53 AM

Matter.js is a 2D rigid body physics engine written in JavaScript. This library can help you easily simulate 2D physics in your browser. It provides many features, such as the ability to create rigid bodies and assign physical properties such as mass, area, or density. You can also simulate different types of collisions and forces, such as gravity friction. Matter.js supports all mainstream browsers. Additionally, it is suitable for mobile devices as it detects touches and is responsive. All of these features make it worth your time to learn how to use the engine, as this makes it easy to create a physics-based 2D game or simulation. In this tutorial, I will cover the basics of this library, including its installation and usage, and provide a

Auto Refresh Div Content Using jQuery and AJAX Auto Refresh Div Content Using jQuery and AJAX Mar 08, 2025 am 12:58 AM

This article demonstrates how to automatically refresh a div's content every 5 seconds using jQuery and AJAX. The example fetches and displays the latest blog posts from an RSS feed, along with the last refresh timestamp. A loading image is optiona

See all articles