Detailed explanation of function usage of js array-JS Tutorial-php.cn

Home

Web Front-end

JS Tutorial

Detailed explanation of function usage of js array

王林

Mar 31, 2020 am 09:14 AM

jsfunctionarray

Detailed explanation of function usage of js array

This article explains the usage of several functions of JS arrays with examples. I hope it will be helpful to everyone.

The examples are as follows:

<html>
    <head>
        <title>js数组进阶</title>
        <meta charset="UTF-8"/>
        <script type="text/javascript">
            var arr=[2,"clannad","海贼王","星游记",true,new Date()];
//            console.log(arr);
            var a=arr.pop();   //删除数组的最后一个元素，返回值为最后一个元素。
//            console.log(a);
//            console.log(arr);
            var a2=arr.shift();  //删除数组的第一个元素，返回值为第一个元素。
//            console.log(a2);
//            console.log(arr);
            var a3=arr.splice(3,1,"月色真美");  //将数组中指定位置的数据替换为输入的数据，返回值为替换掉的元素。餐宿分别为在数组中的位置（起始位置），要替换的个数，替换的数值
//            console.log(a3);
//            console.log(arr);
            var arr2=["龙与虎","境界的彼方"];
            var m="轻音少女";
            var a4=arr.concat(arr2,m);    //数组的元素拼接。返回值为拼接后总数组。后面参数为要拼接在后面的数组。
//            console.log(a4);
//            console.log(arr);
            var a5=arr.join("-");      //数据的链接符，返回值为用输入的连接符链接后的数组元素，类型为string
//            console.log(a5);
//            console.log(arr);
            var a6=arr.push("言叶之庭");    //在数组的最后面添加一个数据，返回值为数组最终的长度。
//            console.log(a6);
//            console.log(arr);
            var a7=arr.unshift("冰菓");     //在数组的最开始添加一个数据，返回值为数据的最终长度。
//            console.log(a7);
//            console.log(arr);
            var a8=arr.reverse();       //将数组的元素倒序排列，返回值为倒序后的数组,原数组也被倒叙。
//            console.log(a8);
//            console.log(arr);
            console.log(arr.valueOf());       //一般的数组的valueof和tostring方法为打印数组的内容。
            console.log(arr.toString());
            var arrsort=[&#39;q&#39;,&#39;w&#39;,&#39;f&#39;,&#39;t&#39;,&#39;h&#39;,&#39;j&#39;];
//            console.log(arrsort);
            var arrsorted=arrsort.sort();
//            console.log(arrsorted);
//            console.log(arrsort);
        </script>
    </head>
    <body>
        <h3 id="js数组进阶">js数组进阶</h3>
    </body>
</html>

Recommended related tutorials: js tutorial

The above is the detailed content of Detailed explanation of function usage of js array. For more information, please follow other related articles on the PHP Chinese website!

Statement

This article is reproduced at:脚本之家. If there is any infringement, please contact admin@php.cn delete

Python vs. JavaScript: Community, Libraries, and ResourcesApr 15, 2025 am 12:16 AM

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.

From C/C to JavaScript: How It All WorksApr 14, 2025 am 12:05 AM

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.

JavaScript Engines: Comparing ImplementationsApr 13, 2025 am 12:05 AM

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.

Beyond the Browser: JavaScript in the Real WorldApr 12, 2025 am 12:06 AM

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.

Building a Multi-Tenant SaaS Application with Next.js (Backend Integration)Apr 11, 2025 am 08:23 AM

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

How to Build a Multi-Tenant SaaS Application with Next.js (Frontend Integration)Apr 11, 2025 am 08:22 AM

This article demonstrates frontend integration with a backend secured by Permit, building a functional EdTech SaaS application using Next.js. The frontend fetches user permissions to control UI visibility and ensures API requests adhere to role-base

JavaScript: Exploring the Versatility of a Web LanguageApr 11, 2025 am 12:01 AM

JavaScript is the core language of modern web development and is widely used for its diversity and flexibility. 1) Front-end development: build dynamic web pages and single-page applications through DOM operations and modern frameworks (such as React, Vue.js, Angular). 2) Server-side development: Node.js uses a non-blocking I/O model to handle high concurrency and real-time applications. 3) Mobile and desktop application development: cross-platform development is realized through ReactNative and Electron to improve development efficiency.

The Evolution of JavaScript: Current Trends and Future ProspectsApr 10, 2025 am 09:33 AM

The latest trends in JavaScript include the rise of TypeScript, the popularity of modern frameworks and libraries, and the application of WebAssembly. Future prospects cover more powerful type systems, the development of server-side JavaScript, the expansion of artificial intelligence and machine learning, and the potential of IoT and edge computing.

See all articles