Set.prototype.delete()

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.

delete() 方法會一個 Set 物件中移除指定元素。

嘗試一下

語法

js
mySet.delete(value);

參數'

value

要從 Set 物件中移除的值。

回傳值

true 如果成功從 Set 物件中移除；反之 false。

範例

使用 delete 方法

js
var mySet = new Set();
mySet.add("foo");

mySet.delete("bar"); // Returns false. No "bar" element found to be deleted.
mySet.delete("foo"); // Returns true.  Successfully removed.

mySet.has("foo"); // Returns false. The "foo" element is no longer present.

下方展示了如何從一個 Set 中移除物件。

js
var setObj = new Set(); // Create a New Set.

setObj.add({ x: 10, y: 20 }); // Add object in the set.

setObj.add({ x: 20, y: 30 }); // Add object in the set.

// Delete any point with `x > 10`.
setObj.forEach(function (point) {
  if (point.x > 10) {
    setObj.delete(point);
  }
});

規範

Specification
ECMAScript Language Specification
# sec-set.prototype.delete

瀏覽器相容性

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參見