Size属性将会返回Set
对象中元素的个数。
The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
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。
size
var mySet = new Set();
mySet.add(1);
mySet.add(5);
mySet.add("some text")
mySet.size; // 3
Specification | Status | Comment |
---|---|---|
Standard | 初始定义 | |
Draft |
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Desktop | Mobile | Server | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
size | Chrome Full support 38 | Edge Full support 12 | Firefox
Full support
19
| IE Full support 11 | Opera Full support 25 | Safari Full support 8 | WebView Android Full support 38 | Chrome Android Full support 38 | Edge Mobile Full support 12 | Firefox Android
Full support
19
| Opera Android Full support 25 | Safari iOS Full support 8 | Samsung Internet Android Full support Yes | nodejs Full support 0.12 |