FileEntrySync

非标
This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

FileEntrySync interface of the 文件系统 API represents a file in a file system. It lets you write content to a file.

Inherits from: EntrySync

About this document

This document was last updated on March 2, 2012 and follows the W3C Specifications (Working Draft) drafted on April 19, 2011.

This specification is more or less abandoned as it didn't get significant traction among browser makers.

基本概念

To write content to file, create a FileWriter object by calling createWriter() .

Method overview

FileWriterSync createWriter () raises ( FileException );
File file () raises ( FileException );

方法

createWriter()

创建新的 FileWriter associated with the file that the FileEntry represents.

void createWriter (
) raises (FileException);
					
Parameter

None.

返回
FileWriterSync
异常

This method can raise a FileException with the following codes:

Exception 描述
NOT_FOUND_ERR The file does not exist.
INVALID_STATE_ERR The file is no longer valid for some reason other than it having been deleted.

file()

Returns a File that represents the current state of the file that this FileEntry represents.

void file (
) raises (FileException);
					
Parameter

None.

返回
File
异常

This method can raise a FileException with the following codes:

Exception 描述
NOT_FOUND_ERR The file does not exist.
INVALID_STATE_ERR The file is no longer valid for some reason other than it having been deleted.

浏览器兼容性

更新 GitHub 上的兼容性数据
Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
FileEntrySync
非标
Chrome 13
Prefixed
13
Prefixed
Prefixed Implemented with the vendor prefix: webkit
Edge ≤79
Prefixed
≤79
Prefixed
Prefixed Implemented with the vendor prefix: webkit
Firefox No IE No Opera No Safari No WebView Android 37
Prefixed
37
Prefixed
Prefixed Implemented with the vendor prefix: webkit
Chrome Android 18
Prefixed
18
Prefixed
Prefixed Implemented with the vendor prefix: webkit
Firefox Android No Opera Android No Safari iOS No Samsung Internet Android 1.0
Prefixed
1.0
Prefixed
Prefixed Implemented with the vendor prefix: webkit

图例

完整支持
完整支持
不支持
不支持
非标。预期跨浏览器支持较差。
非标。预期跨浏览器支持较差。
要求使用供应商前缀或不同名称。
要求使用供应商前缀或不同名称。

另请参阅

Specification: File API: Directories and System Specification WD

Reference: 文件系统 API

Introduction: Basic Concepts About the File System API