Metadata.modificationTime

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句法
范例
浏览器兼容性
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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。

只读 modificationTime 特性为 元数据 接口是 日期 object which specifies the date and time the file system entry (or the data referenced by the entry) was last modified. A file system entry is considered to have been modified if the metadata or the contents of the referenced file (or directory, or whatever other kind of file system entry might exist on the platform in use) has changed.

句法

var modificationTime = Metadata.modificationTime;

值

A 日期 timestamp indicating when the file system entry was last changed.

范例

This example tries to get a particular working file at tmp/workfile.json . Once that file has been found, its metadata is obtained and the file's modification timestamp year is compared to the current year. If it was last modified in a year at least five prior to the current year, the file is removed and a new one is created.

workingDirectory.getFile("tmp/workfile.json", { create: true }, function(fileEntry) {
  fileEntry.getMetadata(function(metadata) {
    if ((new Date().getFullYear() - metadata.modificationTime.getFullYear()) >= 5) {
      fileEntry.remove(function() {
        workingDirectory.getFile("tmp/workfile.json", { create: true }, function(newEntry) {
          fileEntry = newEntry;
        });
      });
    }
  });
}, handleError);

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
`modificationTime` 非标	Chrome 13	Edge ≤79	Firefox No	IE No	Opera No	Safari No	WebView Android No	Chrome Android Yes	Firefox Android No	Opera Android No	Safari iOS No	Samsung Internet Android Yes

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句法

值

范例

浏览器兼容性

图例

另请参阅

相关话题