Set.prototype.clear() - JavaScript 编辑

clear() 方法用来清空一个 Set 对象中的所有元素。

语法

mySet.clear();

返回值

undefined.

示例

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

规范

Specification	Status	Comment
ECMAScript 2015 (6th Edition, ECMA-262) Set.prototype.clear	Standard	Initial definition.
ECMAScript Latest Draft (ECMA-262) Set.prototype.clear	Draft

浏览器兼容性

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

• Desktop
• Mobile

Feature	Chrome	Firefox (Gecko)	Internet Explorer	Opera	Safari
Basic support	38	19.0 (19.0)	11	25	7.1

Feature	Android	Chrome for Android	Firefox Mobile (Gecko)	IE Mobile	Opera Mobile	Safari Mobile
Basic support	未实现	25	19.0 (19.0)	未实现	未实现	8

相关链接

• Set
• Set.prototype.delete()