Size属性将会返回Set对象中元素的个数。
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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 |
|---|---|---|
| Standard | 初始定义 | |
| Draft |
浏览器兼容
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.
Update compatibility data on GitHub
| 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 |
Legend
- Full support
- Full support
- See implementation notes.
- See implementation notes.