函数是 JavaScript 中的基本组件之一。JavaScript 中的函数类似于过程——一组执行任务或计算值的语句。但要成为函数,这个过程应该接受输入并返回与输入存在某些明显关系的输出。要使用一个函数,你必须将其定义在你希望调用它的作用域内。 参见JavaScript 函数的详细参考章节,以了解详情。
闭包是由捆绑起来(封闭的)的函数和函数周围状态(词法环境)的引用组合而成。换言之,闭包让函数能访问它的外部作用域。在 JavaScript 中,闭包会随着函数的创建而同时创建。
Some programming experience. If you are new to programming, try one of the tutorials linked on the main page aboutJavaScript. Where to find JavaScript information The JavaScript documentation on MDN includes the following: Learning the Webprovides information for beginners and introduces basic concepts...
This documentation refers to the latest draft version, which is currently ECMAScript 2017. Do not confuse JavaScript with the Java programming language. Both "Java" and "JavaScript" are trademarks or registered trademarks of Oracle in the U.S. and other countries. However, the two programming ...
The open Web presents incredible opportunities for developers. To take full advantage of these technologies, you need to know how to use them. Below you'll find links to our Web technology documentation.
.github module-examples promises-test .editorconfig .gitignore .prettierrc.json CODE_OF_CONDUCT.md CONTRIBUTING.md LICENSE README.md REVIEWING.md Repository files navigation README Code of conduct CC0-1.0 license js-examples This repository contains examples of JavaScript usage. ...
GitHub repo for the MDN Learning Area. learning learning-js mdn-docs learning-to-code Updated May 6, 2025 HTML mdn / dom-examples Star 3.7k Code Issues Pull requests Code examples that accompany various MDN DOM and Web API documentation pages javascript demo drag-drop dom-manipulation ...
JavaScript Tutorials Documentation for Web developers Documentation for Web developers Web Developer Guide(basic content) The Web Developer Guide provides useful how-to content to help you actually use Web technologies to do what you want or need to do. ...
JavaScript Tutorials Documentation for Web developers Documentation for Web developers Web Developer Guide(basic content) The Web Developer Guide provides useful how-to content to help you actually use Web technologies to do what you want or need to do. ...
together Mozilla brings Microsoft, Google, the W3C, Samsung together to create cross-browser documentation on MDN – The Mozilla Blog 简单总结一下就是：Mozilla, Microsoft, Google, Samsung 和 W3C 将合作把 MDN 打造成最好的 Web 文档。今天开始，Microsoft 会把 MSDN 上相关的页面重定向到 MDN。MSDN...