在此页

• 特性
• 方法
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

FileReaderSync interface allows to read File or Blob objects synchronously.

This interface is only available in workers as it enables synchronous I/O that could potentially block.

特性

This interface does not have any properties.

方法

FileReaderSync.readAsArrayBuffer()

This method converts a specified Blob 或 File into an ArrayBuffer representing the input data as a binary string.

FileReaderSync.readAsBinaryString()

This method converts a specified Blob 或 File 成 DOMString representing the input data as a binary string. This method is deprecated, consider using readAsArrayBuffer() 代替。

FileReaderSync.readAsText()

This method converts a specified Blob 或 File 成 DOMString representing the input data as a text string. The optional encoding parameter indicates the encoding to be used (e.g., iso-8859-1 or UTF-8). If not present, the method will apply a detection algorithm for it.

FileReaderSync.readAsDataURL()

This method converts a specified Blob 或 File 成 DOMString representing the input data as a data URL.

规范

规范	状态	注释
文件 API The definition of 'FileReaderSync' in that specification.	工作草案	初始定义。

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. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
FileReaderSync	Chrome Yes	Edge 12	Firefox 8	IE Yes	Opera Yes	Safari Yes	WebView Android Yes	Chrome Android Yes	Firefox Android 8	Opera Android Yes	Safari iOS Yes	Samsung Internet Android Yes
readAsArrayBuffer	Chrome Yes	Edge 12	Firefox 8	IE Yes	Opera Yes	Safari Yes	WebView Android Yes	Chrome Android Yes	Firefox Android 8	Opera Android Yes	Safari iOS Yes	Samsung Internet Android Yes
readAsBinaryString	Chrome Yes	Edge 12	Firefox 8	IE Yes	Opera Yes	Safari Yes	WebView Android Yes	Chrome Android Yes	Firefox Android 8	Opera Android Yes	Safari iOS Yes	Samsung Internet Android Yes
readAsDataURL	Chrome Yes	Edge 12	Firefox 8	IE Yes	Opera Yes	Safari Yes	WebView Android Yes	Chrome Android Yes	Firefox Android 8	Opera Android Yes	Safari iOS Yes	Samsung Internet Android Yes
readAsText	Chrome Yes	Edge 12	Firefox 8	IE Yes	Opera Yes	Safari Yes	WebView Android Yes	Chrome Android Yes	Firefox Android 8	Opera Android Yes	Safari iOS Yes	Samsung Internet Android Yes
Service workers support 弃用 非标	Chrome 不支持 ? — 59	Edge ?	Firefox 不支持 ? — 61	IE 不支持 No	Opera 不支持 ? — 46	Safari 不支持 No	WebView Android 不支持 ? — 59	Chrome Android 不支持 ? — 59	Firefox Android 不支持 ? — 61	Opera Android 不支持 ? — 43	Safari iOS 不支持 No	Samsung Internet Android 不支持 ? — 7.0
Available in workers	Chrome Yes	Edge 12	Firefox 8	IE Yes	Opera Yes	Safari Yes	WebView Android Yes	Chrome Android Yes	Firefox Android 8	Opera Android Yes	Safari iOS Yes	Samsung Internet Android Yes

图例

完整支持

完整支持

不支持

不支持

兼容性未知 ?

兼容性未知

非标。预期跨浏览器支持较差。

弃用。不要用于新网站。

弃用。不要用于新网站。

另请参阅

• FileReader
• BlobBuilder , Blob
• File
• FileReader

元数据

• 最后修改： Nov 26, 2019

相关话题

1. FileReaderSync
2. 文件 API 相关页面

   1. Blob
   2. File
   3. FileList
   4. FileReader