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 2015年7月.
clear() 方法會從一個 Set 物件中移除其所有元素。
嘗試一下
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
語法
js
mySet.clear();
回傳值
範例
使用 clear 方法
js
var mySet = new Set();
mySet.add(1);
mySet.add("foo");
mySet.size; // 2
mySet.has("foo"); // true
mySet.clear();
mySet.size; // 0
mySet.has("bar"); // false
規範
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-set.prototype.clear |
瀏覽器相容性
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