Set.prototype.size

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该新特性属于 ECMAScript 2015(ES6)规范,在使用时请注意浏览器兼容性。

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 2016 Draft (7th Edition, ECMA-262)
Set.prototype.size

Draft  

浏览器兼容

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).

看这里

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