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
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clear |
Legend
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- Full support
- Full support
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