What's the syntax difference of JavaScript between node.js and browsers?

Question

Browsers support JavaScript, and Node.js supports it too. I want to know if there any syntax difference between them?

Answer 1

Node uses Google V8 , which implements the ECMAScript standard (link to non official annotated copy) .

How it differs from browsers will depend on which browser (and version) you're talking about.

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For example, Mozilla browsers implement JavaScript (which is an implementation and superset of ECMAScript ).

JavaScript includes:

• for each - in loops
• destructuring assignment
• let expressions
• array comprehensions

...among other enhancements that utilize non ECMAScript standard syntax. These are all part of JavaScript , but not currently part of the ECMAScript standard.

(Of the 4 items listed, the last 3 are proposals for the next ECMAScript version.)

Answer 2

No. The Syntax is exactly the same. There are differences in the apis however. The standard browser dom is not available in node but it has additional apis found at nodejs.org . Any syntax differences are due to quirks in browsers.

Answer 3

不会。语法完全相同，但您正在使用它提供不同的环境 - 例如，您没有DOM并且具有用于文件系统访问和套接字的API。