Size属性将会返回Set对象中元素的个数。

描述

size的值是一个整数,表示Set对象有多少条目。size的集合访问函数是undefined; 你不能改变这个属性。

例子

使用size

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

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support381219111258
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support383812191258 Yes

1. From Firefox 13 to Firefox 18, 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 2015 specification.

参见

文档标签和贡献者

此页面的贡献者: zhangchen, SphinxKnight, springuper, OmniP
最后编辑者: zhangchen,