FileSystemFileEntry.createWriter()

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句法
范例
浏览器兼容性
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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。

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This feature is obsolete.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.

非标
此特征是非标准的，且不在标准轨道中。不要在面向 Web 的生产站点中使用它：它不适用于每个用户。实现之间可能存在大的不兼容性，且行为将来可能改变。

FileSystemFileEntry 接口方法 createWriter() 返回 FileWriter object which can be used to write data into the file represented by the directory entry.

句法

FileSystemFileEntry.createWriter(successCallback[, errorCallback]);

参数

successCallback: A callback function which is called when the FileWriter has been created successfully; the FileWriter is passed into the callback as the only parameter.
errorCallback 可选: If provided, this must be a method which is caled when an error occurs while trying to create the FileWriter . This callback receives as input a FileError object describing the error.

返回值

undefined .

范例

此例子建立方法， writeToFileEntry() ，将文本字符串输出到传入目录条目对应文件。

function writeToFileEntry(entry, text) {
  entry.createWriter(function(fileWriter) {
    let data = Blob([text], { type: "text/plain" });
    fileWriter.write(data);
  }, function(fileError) {
    /* do whatever to handle the error */
  });
}

The success callback for the createWriter() call takes the text which was passed in and creates a new Blob object of type text/plain that contains the passed text. This blob is then output to the FileWriter object to be written to the file.

此 API 没有正式的 W3C 或 WHATWG (Web 超文本应用程序技术工作组) 规范。

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
`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

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。

另请参阅

元数据

最后修改： Dec 25, 2019

文件和目录条目 API
FileSystemFileEntry
方法
1. ~~createWriter()~~
2. file()
文件系统 API 相关页面

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句法

参数

返回值

范例

浏览器兼容性

图例

另请参阅

相关话题