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Showing content from https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Map/Map below:

Map() æž„é€ å‡½æ•° - JavaScript

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Map() 构造函数创建 Map 对象。

new Map()
new Map(iterable)

备注： Map() 只能用 new 构造。尝试不使用 new 调用它会抛出 TypeError。

iterable 可选

一个元素是键值对的数组或其他可迭代对象。（例如，包含两个元素的数组，如 [[ 1, 'one' ],[ 2, 'two' ]]。）每个键值对都被添加到新的 Map 中。

const myMap = new Map([
  [1, "one"],
  [2, "two"],
  [3, "three"],
]);

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