JavaScript(JS)是一种具有函数优先特性的轻量级、解释型或者说即时编译型的编程语言。虽然作为 Web 页面中的脚本语言被人所熟知,但是它也被用到了很多非浏览器环境中,例如 Node.js、Apache CouchDB、Adobe Acrobat 等。进一步说,JavaScript 是一种基于原型、多范式、单
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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。
与其他语言相比,函数的 this 关键字在 JavaScript 中的表现略有不同,此外,在严格模式和非严格模式之间也会有一些差别。
MDN Web Docsis an open-source, collaborative project that documents web platform technologies, including CSS, HTML, JavaScript, and Web APIs. We also provide extensive 🧑🎓 learning resources for beginning developers and students. Note:By participating in and contributing to our projects and ...
MDN Web Docsis an open-source, collaborative project that documents web platform technologies, including CSS, HTML, JavaScript, and Web APIs. We also provide extensive 🧑🎓 learning resources for beginning developers and students. Note:By participating in and contributing to our projects and ...
The MDN Web Docs site provides information about Open Web technologies including HTML, CSS, and APIs for both Web sites and progressive web apps.
The MDN Web Docs site provides information about Open Web technologies including HTML, CSS, and APIs for both Web sites and progressive web apps.
Event.initEvent()Deprecated Initializes the value of an Event created. If the event has already been dispatched, this method does nothing. Use the constructor (Event()instead). Specifications Specification DOM #interface-event See also Types of events available:Event reference ...
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。