Set.prototype.clear()
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.
Set 实例的 clear() 方法移除该集合中的所有元素。
尝试一下
const set1 = new Set();
set1.add(1);
set1.add("foo");
console.log(set1.size);
// Expected output: 2
set1.clear();
console.log(set1.size);
// Expected output: 0
语法
js
clear()
参数
无。
返回值
无（undefined）。
示例
使用 clear() 方法
js
const mySet = new Set();
mySet.add(1);
mySet.add("foo");
console.log(mySet.size); // 2
console.log(mySet.has("foo")); // true
mySet.clear();
console.log(mySet.size); // 0
console.log(mySet.has("foo")); // false
规范
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-set.prototype.clear |