FileSystemFileEntry

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特性
方法
基本概念
规范
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这是实验性技术
检查浏览器兼容性表格要小心谨慎在生产中使用这之前。

FileSystemFileEntry 接口在文件系统 API represents a file in a file system. It offers properties describing the file's attributes, as well as the file() method, which creates a File object that can be used to read the file.

特性

继承其父级接口特性， FileSystemEntry , but has no properties unique to this interface.

方法

file(): 创建新的 File 对象可以用于读取文件。

过时方法

createWriter(): 创建新的 FileWriter object which allows writing to the file represented by the file system entry.

基本概念

要将内容写入文件，创建 FileWriter object by calling createWriter() . To read a file, obtain a File object representing its contents by calling file() .

范例

The following code creates an empty file called " log.txt" (if it doesn't exist) and fills it with the text "Meow". Inside the success callback, event handlers are set up to handle the error error and writeend events. The text data is written to the file by creating a blob, appending text to it, and passing the blob to FileWriter.write() .

function onInitFs(fs) {
  fs.root.getFile('log.txt', {create: true}, function(fileEntry) {
    // Create a FileWriter object for our FileSystemFileEntry (log.txt).
    fileEntry.createWriter(function(fileWriter) {
      fileWriter.onwriteend = function(e) {
        console.log('Write completed.');
      };
      fileWriter.onerror = function(e) {
        console.log('Write failed: ' + e.toString());
      };
      // Create a new Blob and write it to log.txt.
      var bb = new BlobBuilder();
      bb.append('Meow');
      fileWriter.write(bb.getBlob('text/plain'));
    }, errorHandler);
  }, errorHandler);
}
window.requestFileSystem(window.TEMPORARY, 1024*1024, onInitFs, errorHandler);

规范

规范	状态	注释
文件和目录条目 API 在该规范中的 FileSystemFileEntry 定义。	草案	提议 API 草案

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
`FileSystemFileEntry`	Chrome 8 Alternate Name 8 Alternate Name Alternate Name Uses the non-standard name: `FileEntry`	Edge 79 Prefixed 79 Prefixed Prefixed Implemented with the vendor prefix: webkit	Firefox 50	IE No	Opera No	Safari 11.1	WebView Android ≤37 Alternate Name ≤37 Alternate Name Alternate Name Uses the non-standard name: `FileEntry`	Chrome Android 18 Alternate Name 18 Alternate Name Alternate Name Uses the non-standard name: `FileEntry`	Firefox Android 50	Opera Android No	Safari iOS 11.3	Samsung Internet Android Yes Prefixed Yes Prefixed Prefixed Implemented with the vendor prefix: webkit
`createWriter` 弃用非标	Chrome 8	Edge 79	Firefox 50 — 52 不支持 50 — 52 While the `createWriter()` method existed, it immediately called `errorCallback` 采用 `NS_ERROR_DOM_SECURITY_ERR` 错误。	IE No	Opera No	Safari No	WebView Android ≤37	Chrome Android 18	Firefox Android 50 — 52 不支持 50 — 52 While the `createWriter()` method existed, it immediately called `errorCallback` 采用 `NS_ERROR_DOM_SECURITY_ERR` 错误。	Opera Android No	Safari iOS No	Samsung Internet Android Yes
`file`	Chrome 8	Edge 79	Firefox 50	IE No	Opera No	Safari 11.1	WebView Android ≤37	Chrome Android 18	Firefox Android 50	Opera Android No	Safari iOS 11.3	Samsung Internet Android Yes

图例

完整支持
不支持
非标。预期跨浏览器支持较差。
弃用。不要用于新网站。


要求使用供应商前缀或不同名称。

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元数据

最后修改： Dec 25, 2019

在此页

特性

方法

过时方法

基本概念

范例

规范

浏览器兼容性

图例

另请参阅

相关话题