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.

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® 2025 Language Specification
# sec-set.prototype.clear

瀏覽器相容性

Report problems with this compatibility data on GitHub
desktopmobileserver
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Deno
Node.js
clear

Legend

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Full support
Full support

參見