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

Map.prototype.delete() - JavaScript | MDN

Baseline Widely available

Map 实例的 delete() 方法从该 map 中删除指定键的元素。

const map1 = new Map();
map1.set("bar", "foo");

console.log(map1.delete("bar"));
// Expected result: true
// True indicates successful removal

console.log(map1.has("bar"));
// Expected result: false

key

要从 Map 对象中删除的元素的键。

如果 Map 对象中的元素存在并已被移除，则为 true；如果该元素不存在，则为 false。

const myMap = new Map();
myMap.set("bar", "foo");

console.log(myMap.delete("bar")); // 返回 true。成功地移除元素
console.log(myMap.has("bar")); // 返回 false。"bar" 元素将不再存在于 Map 实例中

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