Map.prototype.keys()
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
尝试一下
语法
js
keys()
参数
无。
返回值
一个新的可迭代迭代器对象。
示例
使用 keys()
js
const myMap = new Map();
myMap.set("0", "foo");
myMap.set(1, "bar");
myMap.set({}, "baz");
const mapIter = myMap.keys();
console.log(mapIter.next().value); // "0"
console.log(mapIter.next().value); // 1
console.log(mapIter.next().value); // {}
规范
Specification |
---|
ECMAScript Language Specification # sec-map.prototype.keys |
浏览器兼容性
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