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### 3.1 语言支持
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#### 3.1.1 ES2019支持
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#### 3.1.1 ES2020支持
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The ES2019 specification[2](#FOOT2)is almost fully supported including the Annex B (legacy web compatibility) and the Unicode related features. The following features are not supported yet:
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包含Annex B (遗留Web兼容)和Unicode相关功能的ES2020规范[2](#FOOT2)已经基本支持。 目前尚未支持以下功能:
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* Realms (althougth the C API supports different runtimes and contexts)
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* Realms (尽管C API支持不同的运行时和上下文)
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* Tail calls[3](#FOOT3)
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#### 3.1.2 JSON
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The JSON parser is currently more tolerant than the specification.
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JSON解析器目前比规范支持范围更宽.
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#### 3.1.3 ECMA402
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ECMA402 (Internationalization API) is not supported.
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ECMA402 (国际化API)尚未支持.
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#### 3.1.4 扩展
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*The directive `"use strip"`indicates that the debug information (including the source code of the functions) should not be retained to save memory. As `"use strict"`, the directive can be global to a script or local to a function.
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*The first line of a script beginning with `#!`is ignored.
The mathematical extensions are available in the `qjsbn`version and are fully backward compatible with standard Javascript. See `jsbignum.pdf` for more information.
*The `BigInt` (big integers) TC39 proposal is supported.
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*`BigFloat`support: arbitrary large floating point numbers in base 2.
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*Operator overloading.
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*The directive `"use bigint"` enables the bigint mode where integers are `BigInt` by default.
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*The directive `"use math"` enables the math mode where the division and power operators on integers produce fractions. Floating point literals are `BigFloat` by default and integers are `BigInt` by default.
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