FileSystemEntry

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.

FileSystemEntry interface of the File and Directory Entries API represents a single in a file system. The entry can be a file or a directory (directories are represented by the DirectoryEntry interface). It includes methods for working with files—including copying, moving, removing, and reading files—as well as information about a file it points to—including the file name and its path from the root to the entry.

Because this is a non-standard API, whose specification is not currently on a standards track, it's important to keep in mind that not all browsers implement it, and those that do may implement only small portions of it. Check the 浏览器兼容性 section for details.

基本概念

You don't create FileSystemEntry objects directly. Instead, you will receive an object based on this interface through other APIs. This interface serves as a base class for the FileSystemFileEntry and FileSystemDirectoryEntry interfaces, which provide features specific to file system entries representing files and directories, respectively.

FileSystemEntry interface includes methods that you would expect for manipulating files and directories, but it also includes a convenient method for obtaining the URL of the entry: toURL() . It also introduces a new URL scheme: filesystem: .

可以使用 filesystem: scheme on Google Chrome to see all the files and folders that are stored in the origin of your app. Just use filesystem: scheme for the root directory of the origin of the app. For example, if your app is in http://www.html5rocks.com , open filesystem: http://www.html5rocks.com/temporary/ in a tab. Chrome shows a read-only list of all the files and folders stored the origin of your app.

范例

To see an example of how toURL() works, see the method description . The snippet below shows you how you can remove a file by name.

// Taking care of the browser-specific prefixes.
window.requestFileSystem  = window.requestFileSystem || window.webkitRequestFileSystem;
...
// Opening a file system with temporary storage
window.requestFileSystem(TEMPORARY, 1024*1024 /*1MB*/, function(fs) {
  fs.root.getFile('log.txt', {}, function(fileEntry) {
    fileEntry.remove(function() {
      console.log('File removed.');
    }, onError);
  }, onError);
}, onError);
					

特性

This interface provides the following properties.

filesystem 只读
A FileSystem object representing the file system in which the entry is located.
fullPath 只读
A USVString object which provides the full, absolute path from the file system's root to the entry; it can also be thought of as a path which is relative to the root directory, prepended with a "/" character.
isDirectory 只读
A Boolean which is true if the entry represents a directory; otherwise, it's false .
isFile 只读
A Boolean which is true if the entry represents a file. If it's not a file, this value is false .
name 只读
A USVString containing the name of the entry (the final part of the path, after the last "/" character).

方法

This interface defines the following methods.

copyTo()
Copies the file or directory to a new location on the file system.
getMetadata()
Obtains metadata about the file, such as its modification date and size.
getParent()
返回 FileSystemDirectoryEntry representing the entry's parent directory.
moveTo()
Moves the file or directory to a new location on the file system, or renames the file or directory.
remove()
Removes the specified file or directory. You can only remove directories which are empty.
toURL()
Creates and returns a URL which identifies the entry. This URL uses the URL scheme "filesystem:" .

规范

规范 状态 Comment
文件和目录条目 API 草案 提议 API 草案

此 API 没有正式的 W3C 或 WHATWG 规范。

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
FileSystemEntry
Chrome 8
Alternate Name
8
Alternate Name
Alternate Name Uses the non-standard name: Entry
Edge 79
Prefixed
79
Prefixed
Prefixed Implemented with the vendor prefix: webkit
Firefox 50 IE 不支持 No Opera 不支持 No Safari 11.1 WebView Android ≤37
Alternate Name
≤37
Alternate Name
Alternate Name Uses the non-standard name: Entry
Chrome Android 18
Alternate Name
18
Alternate Name
Alternate Name Uses the non-standard name: Entry
Firefox Android 50 Opera Android 不支持 No Safari iOS 11.3 Samsung Internet Android Yes
Prefixed
Yes
Prefixed
Prefixed Implemented with the vendor prefix: webkit
copyTo
弃用 非标
Chrome 8 Edge 79 Firefox 不支持 No IE 不支持 No Opera 不支持 No Safari 不支持 No WebView Android ≤37 Chrome Android 18 Firefox Android 不支持 No Opera Android 不支持 No Safari iOS 不支持 No Samsung Internet Android Yes
filesystem
Chrome 8 Edge 79 Firefox 50 IE 不支持 No Opera 不支持 No Safari 11.1 WebView Android ≤37 Chrome Android 18 Firefox Android 50 Opera Android 不支持 No Safari iOS 11.3 Samsung Internet Android Yes
fullPath
Chrome 8 Edge 79 Firefox 50 IE 不支持 No Opera 不支持 No Safari 11.1 WebView Android ≤37 Chrome Android 18 Firefox Android 50 Opera Android 不支持 No Safari iOS 11.3 Samsung Internet Android Yes
getMetadata
弃用 非标
Chrome 8 Edge 79 Firefox 不支持 No IE 不支持 No Opera 不支持 No Safari 不支持 No WebView Android ≤37 Chrome Android 18 Firefox Android 不支持 No Opera Android 不支持 No Safari iOS 不支持 No Samsung Internet Android Yes
getParent
Chrome 8 Edge 79 Firefox 不支持 No IE 不支持 No Opera 不支持 No Safari 11.1 WebView Android ≤37 Chrome Android 18 Firefox Android 不支持 No Opera Android 不支持 No Safari iOS 11.3 Samsung Internet Android Yes
isDirectory
Chrome 8 Edge 79 Firefox 50 IE 不支持 No Opera 不支持 No Safari 11.1 WebView Android ≤37 Chrome Android 18 Firefox Android 50 Opera Android 不支持 No Safari iOS 11.3 Samsung Internet Android Yes
isFile
Chrome 8 Edge 79 Firefox 50 IE 不支持 No Opera 不支持 No Safari 11.1 WebView Android ≤37 Chrome Android 18 Firefox Android 50 Opera Android 不支持 No Safari iOS 11.3 Samsung Internet Android Yes
moveTo
弃用 非标
Chrome 8 Edge 79 Firefox 不支持 No IE 不支持 No Opera 不支持 No Safari 不支持 No WebView Android ≤37 Chrome Android 18 Firefox Android 不支持 No Opera Android 不支持 No Safari iOS 不支持 No Samsung Internet Android Yes
name
Chrome 8 Edge 79 Firefox 50 IE 不支持 No Opera 不支持 No Safari 11.1 WebView Android ≤37 Chrome Android 18 Firefox Android 50 Opera Android 不支持 No Safari iOS 11.3 Samsung Internet Android Yes
remove
弃用 非标
Chrome 8 Edge 79 Firefox 不支持 No IE 不支持 No Opera 不支持 No Safari 不支持 No WebView Android ≤37 Chrome Android 18 Firefox Android 不支持 No Opera Android 不支持 No Safari iOS 不支持 No Samsung Internet Android Yes
toURL
弃用 非标
Chrome 8 Edge 79 Firefox 不支持 No IE 不支持 No Opera 不支持 No Safari 不支持 No WebView Android ≤37 Chrome Android 18 Firefox Android 不支持 No Opera Android 不支持 No Safari iOS 不支持 No Samsung Internet Android Yes

图例

完整支持
完整支持
不支持
不支持
实验。期望将来行为有所改变。
实验。期望将来行为有所改变。
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。
使用非标名称。
使用非标名称。
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