FileReaderSync.readAsText()

在此页


								readAsText()

方法在


									FileReaderSync

interface allows to read


									File


									Blob

objects in a synchronous way into an


									DOMString

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

readAsText(File);
readAsText(Blob);
readAsText(File, encoding);
readAsText(Blob, encoding);

DOMString representing the input data.

The following exceptions can be raised by this method:

NotFoundError

is raised when the resource represented by the DOM


									File


									Blob

cannot be found, e.g. because it has been erased.

SecurityError

is raised when one of the following problematic situation is detected:

the resource has been modified by a third party;
too many read are performed simultaneously;
the file pointed by the resource is unsafe for a use from the Web (like it is a system file).

NotReadableError

is raised when the resource cannot be read due to a permission problem, like a concurrent lock.

EncodingError

is raised when the resource is a data URL and exceed the limit length defined by each browser.

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

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
`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