WindowOrWorkerGlobalScope.atob() 对用base-64编码过的字符串进行解码 。你可以使用 window.btoa() 方法来编码一个可能在传输过程中出现问题的数据，并且在接受数据之后，使用 atob() 方法再将数据解码。例如：你可以编码、传输和解码操作各种字符，比如0-31的ASCII码值。
关于针对Unicode或者UTF-8的应用方面，请查看 this note at Base64 encoding and decoding 和 this note at window.btoa()。
语法
var decodedData = scope.atob(encodedData);
异常
如果传入字符串的长度不是4的倍数，则抛出DOMException。
示例
let encodedData = window.btoa("Hello, world"); // 编码
let decodedData = window.atob(encodedData); // 解码
规范
| Specification | Status | Comment |
|---|---|---|
| HTML Living Standard WindowBase64.atob() |
Living Standard | No change since the latest snapshot, HTML 5.1. |
| HTML 5.1 WindowBase64.atob() |
Recommendation | Snapshot of HTML Living Standard. No change. |
| HTML5 WindowBase64.atob() |
Recommendation | Snapshot of HTML Living Standard. Creation of WindowBase64 (properties were on the target before it). |
浏览器兼容性
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 | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Basic support | Chrome Full support Yes | Edge Full support Yes | Firefox
Full support
1
| IE Full support 10 | Opera Full support Yes | Safari Full support Yes | WebView Android Full support Yes | Chrome Android Full support Yes | Edge Mobile ? | Firefox Android
Full support
4
| Opera Android ? | Safari iOS Full support Yes | Samsung Internet Android ? |
Legend
- Full support
- Full support
- Compatibility unknown
- Compatibility unknown
- See implementation notes.
- See implementation notes.