JavaScript 和 WebAssembly 新特性

本节介绍 JavaScript 语言中的新特性,这些语言特性定义在 ECMA-262 (ECMAScript)ECMA-402 (the ECMAScript Internationalization API),以及 WebAssembly (Wasm)

我们的目标是通过 易于理解的代码示例 来提供新语言特性的 简明说明。有关更深入的文档,请参阅每个解释中的外部链接。

  1. Finding elements in Arrays and TypedArrays ECMAScript
  2. at method for relative indexing ECMAScript
  3. Error causes ECMAScript
  4. Object.hasOwn ECMAScript
  5. Import assertions ECMAScript
  6. Private brand checks a.k.a. #foo in obj ECMAScript
  7. Class static initialization blocks ECMAScript
  8. WebAssembly integration with JavaScript BigInt WebAssembly ECMAScript
  9. Atomics.wait, Atomics.notify, Atomics.waitAsync ECMAScript ES2020
  10. Logical assignment ECMAScript ES2021
  11. Intl.DisplayNames Intl
  12. Fast, parallel applications with WebAssembly SIMD WebAssembly
  13. RegExp match indices ECMAScript
  14. String.prototype.replaceAll ECMAScript ES2021
  15. Top-level await ECMAScript
  16. Nullish coalescing ECMAScript ES2020
  17. Optional chaining ECMAScript ES2020
  18. Subsume JSON a.k.a. JSON ⊂ ECMAScript ES2019
  19. Intl.NumberFormat Intl
  20. globalThis ECMAScript ES2020
  21. Weak references and finalizers ECMAScript ES2021
  22. 稳定的数组排序 Array.prototype.sort ECMAScript ES2019
  23. Symbol.prototype.description ECMAScript ES2019
  24. Object.fromEntries ECMAScript ES2019
  25. Promise combinators ECMAScript ES2020 ES2021
  26. Array.prototype.flatArray.prototype.flatMap ECMAScript ES2019
  27. Numeric separators ECMAScript ES2021
  28. String.prototype.matchAll ECMAScript ES2020
  29. Intl.ListFormat Intl
  30. Module namespace exports ECMAScript ES2020
  31. Public and private class fields ECMAScript ES2022
  32. Intl.RelativeTimeFormat Intl
  33. Well-formed JSON.stringify ECMAScript ES2019
  34. JavaScript modules ECMAScript ES2015
  35. BigInt: arbitrary-precision integers in JavaScript ECMAScript ES2020
  36. Optional catch binding ECMAScript ES2019
  37. String.prototype.trimStart and String.prototype.trimEnd ECMAScript ES2019
  38. Revised Function.prototype.toString ECMAScript ES2019
  39. Dynamic import() ECMAScript ES2020
  40. Promise.prototype.finally ECMAScript ES2018
  41. Intl.PluralRules Intl
  42. Object rest and spread properties ECMAScript ES2018