Set.prototype.add()
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.
add() 會在一個 Set 物件的尾端加上一個指定 value 的新元素。
嘗試一下
const set1 = new Set();
set1.add(42);
set1.add(42);
set1.add(13);
for (const item of set1) {
console.log(item);
// Expected output: 42
// Expected output: 13
}
語法
js
mySet.add(value);
參數
value-
要被加到
Set物件中的值。
回傳值
Set 物件本身。
範例
使用 add 方法
js
var mySet = new Set();
mySet.add(1);
mySet.add(5).add("some text"); // chainable
console.log(mySet);
// Set [1, 5, "some text"]
規範
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-set.prototype.add |