Attribute是属性的意思,文章仅对部分兼容IE和FF的Attribute相关的介绍。
attributes:获取一个属性作为对象
getAttribute:获取某一个属性的值
setAttribute:建立一个属性,并同时给属性捆绑一个值
createAttribute:仅建立一个属性
removeAttribute:删除一个属性
getAttributeNode:获取一个节点作为对象
setAttributeNode:建立一个节点
removeAttributeNode:删除一个节点
attributes可以获取一个对象中的一个属性,并且作为对象来调用,注意在这里要使用“[]”,IE在这里可以使用“()”,考虑到兼容性的问题,要使用“[]”。关于attributes属性的使用方式上,IE和FF有巨大的分歧,在此不多介绍。
attributes的使用方法:(IE和FF通用)
<body> <div id = "t"><input type = "hidden" id = "sss" value = "aaa"></div> </body> <script> var d = document.getElementById("sss").attributes["value"]; document.write(d.name); document.write(d.value); //显示value aaa </script>
getAttribute,setAttribute,createAttribute,removeAttribute四兄弟的概念比较容易理解,使用方法也比较简单,唯一需要注意这几点:
1、createAttribute在使用的时候不需要基于对象的,document.createAttribute()就可以。
2、setAttribute,createAttribute在使用的时候不要使用name,type,value等单词,IE和FF的反应都奇怪的难以理解。
3、createAttribute在使用的时候如果只定义了名字,没有d.nodeValue = "hello";语句定义值,FF会认为是一个空字符串,IE认为是undefined,注意到这点就可以了。
getAttribute的使用方法:
<body> <div id = "t"><input type = "hidden" id = "sss" value = "aaa"></div> </body> <script> var d = document.getElementById("sss").getAttribute("value"); document.write(d); //显示 aaa </script>
setAttribute的使用方法:(你会发现多了一个名为good的属性hello)
<body> <div id = "t"><input type = "hidden" id = "sss" value = "aaa"></div> </body> <script> var d = document.getElementById("sss").setAttribute("good","hello"); alert(document.getElementById("t").innerHTML) </script>
createAttribute的使用方法:(多了一个名为good的空属性)
<head> <meta charset="UTF-8"> <title></title> <script> window.onload = function (){ var oBox = document.getElementById('box'); alert( document.body.innerHTML ); oBox.setAttribute('value','name'); alert( document.body.innerHTML ); attr = document.createAttribute('hallo'); alert( document.body.innerHTML );/*同上*/ attr.nodeValue = 'world';/*对自定义属性进行编辑*/ alert( document.body.innerHTML );/*同上*/ oBox.setAttributeNode(attr);/*对标签插入自定义属性*/ alert( document.body.innerHTML );/*改变*/ }; </script> </head> <body> <ul id="box"> </ul> </body>
removeAttribute的使用方法:(少了一个)
<body> <div id = "t"><input type = "hidden" id = "sss" value = "aaa"></div> </body> <script> var d = document.getElementById("sss").removeAttribute("value"); alert(document.getElementById("t").innerHTML) </script>
getAttributeNode,setAttributeNode,removeAttributeNode三个方法的特点是都直接操作一个node(节点),removeAttributeNode在一开始的时候总会用错,但是充分理解了node的含义的时候,就能够应用自如了。
getAttributeNode的使用方法:
<body> <div id = "t"><input type = "hidden" id = "sss" value = "aaa"></div> </body> <script> var d = document.getElementById("sss").getAttributeNode("value"); document.write(d.name); document.write(d.value); //显示 value aaa </script>
setAttributeNode的使用方法:
<body> <div id = "t"><input type = "hidden" id = "sss" value = "aaa"></div> </body> <script> var d = document.createAttribute("good"); document.getElementById("sss").setAttributeNode(d); alert(document.getElementById("t").innerHTML); </script>
removeAttributeNode的使用方法:
<body> <div id = "t"><input type = "hidden" id = "sss" value = "aaa"></div> </body> <script> var d = document.getElementById("sss").getAttributeNode("value") document.getElementById("sss").removeAttributeNode(d); alert(document.getElementById("t").innerHTML); </script>
以上这篇JS Attribute属性操作详解就是小编分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持脚本之家。

The main uses of JavaScript in web development include client interaction, form verification and asynchronous communication. 1) Dynamic content update and user interaction through DOM operations; 2) Client verification is carried out before the user submits data to improve the user experience; 3) Refreshless communication with the server is achieved through AJAX technology.

Understanding how JavaScript engine works internally is important to developers because it helps write more efficient code and understand performance bottlenecks and optimization strategies. 1) The engine's workflow includes three stages: parsing, compiling and execution; 2) During the execution process, the engine will perform dynamic optimization, such as inline cache and hidden classes; 3) Best practices include avoiding global variables, optimizing loops, using const and lets, and avoiding excessive use of closures.

Python is more suitable for beginners, with a smooth learning curve and concise syntax; JavaScript is suitable for front-end development, with a steep learning curve and flexible syntax. 1. Python syntax is intuitive and suitable for data science and back-end development. 2. JavaScript is flexible and widely used in front-end and server-side programming.

Python and JavaScript have their own advantages and disadvantages in terms of community, libraries and resources. 1) The Python community is friendly and suitable for beginners, but the front-end development resources are not as rich as JavaScript. 2) Python is powerful in data science and machine learning libraries, while JavaScript is better in front-end development libraries and frameworks. 3) Both have rich learning resources, but Python is suitable for starting with official documents, while JavaScript is better with MDNWebDocs. The choice should be based on project needs and personal interests.

The shift from C/C to JavaScript requires adapting to dynamic typing, garbage collection and asynchronous programming. 1) C/C is a statically typed language that requires manual memory management, while JavaScript is dynamically typed and garbage collection is automatically processed. 2) C/C needs to be compiled into machine code, while JavaScript is an interpreted language. 3) JavaScript introduces concepts such as closures, prototype chains and Promise, which enhances flexibility and asynchronous programming capabilities.

Different JavaScript engines have different effects when parsing and executing JavaScript code, because the implementation principles and optimization strategies of each engine differ. 1. Lexical analysis: convert source code into lexical unit. 2. Grammar analysis: Generate an abstract syntax tree. 3. Optimization and compilation: Generate machine code through the JIT compiler. 4. Execute: Run the machine code. V8 engine optimizes through instant compilation and hidden class, SpiderMonkey uses a type inference system, resulting in different performance performance on the same code.

JavaScript's applications in the real world include server-side programming, mobile application development and Internet of Things control: 1. Server-side programming is realized through Node.js, suitable for high concurrent request processing. 2. Mobile application development is carried out through ReactNative and supports cross-platform deployment. 3. Used for IoT device control through Johnny-Five library, suitable for hardware interaction.

I built a functional multi-tenant SaaS application (an EdTech app) with your everyday tech tool and you can do the same. First, what’s a multi-tenant SaaS application? Multi-tenant SaaS applications let you serve multiple customers from a sing


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

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Dreamweaver CS6
Visual web development tools

Atom editor mac version download
The most popular open source editor

Zend Studio 13.0.1
Powerful PHP integrated development environment

SublimeText3 Mac version
God-level code editing software (SublimeText3)

DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software