DEVELOPER . MOZILLA . ORG {
}
Title:
JavaScript 语言概览 - JavaScript | MDN
Description:
JavaScript 是一门多范式的动态语言，它包含类型、运算符、标准内置对象和方法。它的语法基于 Java 和 C 语言——这两门语言的许多结构也适用于 JavaScript。JavaScript 使用对象原型和类支持面向对象编程。它也支持函数式编程，因为函数是头等对象，它能通过表达式轻松创建，并像其他对象一样进行传递。
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27 years and 5 months (reg. 1998-01-24).
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Keywords {🔍}
javascript, copy, clipboard, const, return, mdn, function, true, number, undefined, sum, args, web, content, myletvariable, throw, item, avg, count, python, false, foo, promise, search, learn, blog, java, symbol, objname, child, err, url, skip, 运算符, error, ieee, consolelog, nan, unicode, world, length, age, boolean, obj, kittens, break, buildmysitewebsite, arr, babies, add,
Topics {✒️}
++/java 的 javascript 的 mdn web docs idontexist）会返回 undefined。 变量声明时未初始化（ 在大多数其他语言中，上面的代码会输出“1”和“2”，因为在 const // false boolean instanceof rangeerror javascript 没有 elif， initialization”。想要了解更多信息，参见 array api // myletvariable 在这不可见 javascript 类只是必须使用 激活匿名函数——也就是说，它从语义上和使用 function avg ）会隐式地返回 undefined。 访问对象上不存在的属性（obj （其对可迭代对象进行迭代，特别是数组）和 export const clipboard boolean ，将字符串解析为浮点数。 number error = 和 和 、const、var。 case clipboard math undefined clipboard function avg blog careers advertise object clipboard function parentfunc clipboard function add clipboard function countchars js clipboard function foo clipboard function buildmysite break return total true true] obj[username] = prompt creative commons license function counter function nestedfunc function dosomething improve mdn mdn contributors bluesky mdn mastodon mdn const currentvalue references learn
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