Home Web Front-end JS Tutorial Analysis of two common situations of js closure

Analysis of two common situations of js closure

Sep 22, 2017 am 10:24 AM
javascript Condition parse

//闭包两种情况  1:函数作为返回值
function fn() {
    var max =10;
    return function bar(x) {
        if(x > max){
          console.log(x)
        }else{
            console.log(666)
        }
    }
}
var f1=fn(),max = 100;
f1(15)    //15
//这里fn()赋给f1,调用f1时,即执行bar函数,此时x=15,
//max的取值需是创建该函数的作用域内,即max=10;最后输出15.
Copy after login
//2:函数作为参数传递
    var max=10,
        fn=function (x) {
            if(x > max){
                console.log(x)
            }else{
                console.log('000')
            }
        };
        (function (f) {
            var max = 100;
            f(15)
        })(fn)
    //这是第二种情况,fn函数作为f参数,f(15)就是执行 fn(15);
    //此时x=15,max的取值应该是创建fn函数的作用域内取,即10,输出结果是15;
Copy after login

The above is the detailed content of Analysis of two common situations of js closure. For more information, please follow other related articles on the PHP Chinese website!

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

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

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)

A deep dive into the meaning and usage of HTTP status code 460 A deep dive into the meaning and usage of HTTP status code 460 Feb 18, 2024 pm 08:29 PM

In-depth analysis of the role and application scenarios of HTTP status code 460 HTTP status code is a very important part of web development and is used to indicate the communication status between the client and the server. Among them, HTTP status code 460 is a relatively special status code. This article will deeply analyze its role and application scenarios. Definition of HTTP status code 460 The specific definition of HTTP status code 460 is "ClientClosedRequest", which means that the client closes the request. This status code is mainly used to indicate

iBatis and MyBatis: Comparison and Advantage Analysis iBatis and MyBatis: Comparison and Advantage Analysis Feb 18, 2024 pm 01:53 PM

iBatis and MyBatis: Differences and Advantages Analysis Introduction: In Java development, persistence is a common requirement, and iBatis and MyBatis are two widely used persistence frameworks. While they have many similarities, there are also some key differences and advantages. This article will provide readers with a more comprehensive understanding through a detailed analysis of the features, usage, and sample code of these two frameworks. 1. iBatis features: iBatis is an older persistence framework that uses SQL mapping files.

Detailed explanation of Oracle error 3114: How to solve it quickly Detailed explanation of Oracle error 3114: How to solve it quickly Mar 08, 2024 pm 02:42 PM

Detailed explanation of Oracle error 3114: How to solve it quickly, specific code examples are needed. During the development and management of Oracle database, we often encounter various errors, among which error 3114 is a relatively common problem. Error 3114 usually indicates a problem with the database connection, which may be caused by network failure, database service stop, or incorrect connection string settings. This article will explain in detail the cause of error 3114 and how to quickly solve this problem, and attach the specific code

Parsing Wormhole NTT: an open framework for any Token Parsing Wormhole NTT: an open framework for any Token Mar 05, 2024 pm 12:46 PM

Wormhole is a leader in blockchain interoperability, focused on creating resilient, future-proof decentralized systems that prioritize ownership, control, and permissionless innovation. The foundation of this vision is a commitment to technical expertise, ethical principles, and community alignment to redefine the interoperability landscape with simplicity, clarity, and a broad suite of multi-chain solutions. With the rise of zero-knowledge proofs, scaling solutions, and feature-rich token standards, blockchains are becoming more powerful and interoperability is becoming increasingly important. In this innovative application environment, novel governance systems and practical capabilities bring unprecedented opportunities to assets across the network. Protocol builders are now grappling with how to operate in this emerging multi-chain

Analysis of the meaning and usage of midpoint in PHP Analysis of the meaning and usage of midpoint in PHP Mar 27, 2024 pm 08:57 PM

[Analysis of the meaning and usage of midpoint in PHP] In PHP, midpoint (.) is a commonly used operator used to connect two strings or properties or methods of objects. In this article, we’ll take a deep dive into the meaning and usage of midpoints in PHP, illustrating them with concrete code examples. 1. Connect string midpoint operator. The most common usage in PHP is to connect two strings. By placing . between two strings, you can splice them together to form a new string. $string1=&qu

Analysis of new features of Win11: How to skip logging in to Microsoft account Analysis of new features of Win11: How to skip logging in to Microsoft account Mar 27, 2024 pm 05:24 PM

Analysis of new features of Win11: How to skip logging in to a Microsoft account. With the release of Windows 11, many users have found that it brings more convenience and new features. However, some users may not like having their system tied to a Microsoft account and wish to skip this step. This article will introduce some methods to help users skip logging in to a Microsoft account in Windows 11 and achieve a more private and autonomous experience. First, let’s understand why some users are reluctant to log in to their Microsoft account. On the one hand, some users worry that they

Apache2 cannot correctly parse PHP files Apache2 cannot correctly parse PHP files Mar 08, 2024 am 11:09 AM

Due to space limitations, the following is a brief article: Apache2 is a commonly used web server software, and PHP is a widely used server-side scripting language. In the process of building a website, sometimes you encounter the problem that Apache2 cannot correctly parse the PHP file, causing the PHP code to fail to execute. This problem is usually caused by Apache2 not configuring the PHP module correctly, or the PHP module being incompatible with the version of Apache2. There are generally two ways to solve this problem, one is

Analysis of exponential functions in C language and examples Analysis of exponential functions in C language and examples Feb 18, 2024 pm 03:51 PM

Detailed analysis and examples of exponential functions in C language Introduction: The exponential function is a common mathematical function, and there are corresponding exponential function library functions that can be used in C language. This article will analyze in detail the use of exponential functions in C language, including function prototypes, parameters, return values, etc.; and give specific code examples so that readers can better understand and use exponential functions. Text: The exponential function library function math.h in C language contains many functions related to exponentials, the most commonly used of which is the exp function. The prototype of exp function is as follows

See all articles