在此页

• 句法
• 范例
• 浏览器兼容性
• 另请参阅
• 相关话题

过时
This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.

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FileSystemEntry 接口方法 getMetadata () obtains a 元数据 object with information about the file system entry, such as its modification date and time and its size.

句法

FileSystemEntry.getMetadata(successCallback[, errorCallback]);
					

参数

successCallback

A function which is called when the copy operation is succesfully completed. Receives a single input parameter: a 元数据 object with information about the file.

errorCallback 可选

An optional callback which is executed if an error occurs while looking up the metadata. There's a single parameter: a FileError describing what went wrong.

返回值

undefined .

错误

FileError.NOT_FOUND_ERR

FileSystemEntry refers to an item which doesn't exist.

FileError.SECURITY_ERR

Security restrictions prohibit obtaining the requested metadata.

范例

This example checks the size of a log file in a temporary folder and, if it exceeds a megabyte, moves it into a different directory.

workingDirectory.getFile("tmp/log.txt", {}, function(fileEntry) {
  fileEntry.getMetadata(function(metadata) {
    if (metadata.size > 1048576) {
      workingDirectory.getDirectory("log", {}, function(dirEntry) {
        fileEntry.moveTo(dirEntry);
      }, handleError);
    }
  });
}, handleError);
					

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
getMetadata 弃用 非标	Chrome 8	Edge 79	Firefox No	IE No	Opera No	Safari No	WebView Android ≤37	Chrome Android 18	Firefox Android No	Opera Android No	Safari iOS 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。

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

• 文件和目录条目 API
• 文件系统 API 介绍

元数据

• 最后修改： Dec 25, 2019

相关话题

1. 文件和目录条目 API
2. FileSystemEntry
3. 特性

   1. filesystem
   2. fullPath
   3. isDirectory
   4. isFile
   5. 名称
4. 方法

   1. copyTo()
   2. getMetadata()
   3. getParent()
   4. moveTo()
   5. remove()
   6. toURL()
5. 文件系统 API 相关页面

   1. FileError
   2. FileException
   3. FileHandle
   4. FileRequest
   5. FileSystem
   6. FileSystemDirectoryEntry
   7. FileSystemDirectoryEntrySync
   8. FileSystemDirectoryReader
   9. FileSystemDirectoryReaderSync
   10. FileSystemEntrySync
   11. FileSystemFileEntry
   12. FileSystemFileEntrySync
   13. FileSystemFlags
   14. FileSystemSync
   15. HTMLInputElement
   16. LocalFileSystem
   17. LocalFileSystemSync
   18. LockedFile
   19. 元数据
   20. Window.requestFileSystem()
   21. Window.resolveLocalFileSystemURL()
   22. WorkerGlobalScope.requestFileSystemSync()