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Size属性将会返回Set对象中元素的个数。

说明

Size的值表示Set对象拥有多少个元素。通过调用函数的形式访问Size会提示为undefined;并且该值不能够被更改。

例子

使用

var mySet = new Set();
mySet.add(1);
mySet.add(5);
mySet.add("some text")

mySet.size; // 3

规范

Specification Status Comment

ECMAScript 2015 (6th Edition, ECMA-262)
Set.prototype.size

Standard 初始定义

ECMAScript Latest Draft (ECMA-262)
Set.prototype.size

Draft  

浏览器兼容

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!

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support 38 19 (19) [1] 11 25 7.1
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support 未实现 38 19.0 (19) 未实现 未实现 8

[1] From Gecko 13 (Firefox 13 / Thunderbird 13 / SeaMonkey 2.10) to Gecko 18 (Firefox 18 / Thunderbird 18 / SeaMonkey 2.15 / Firefox OS 1.0.1 / Firefox OS 1.1) the size property was implemented as a Set.prototype.size() method, this has been changed to a property in later versions conform to the ECMAScript 6 specification (bug 807001).

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