[TOC]

FileSystem APIs

接口类型

DOMFileSystem

root : DirectoryEntry

根目录

name : String

名称

DirectoryEntry & FileEntry inherit from Entry

• properties

  • filesystem : DOMFileSystem

    指向 DOMFileSystem

  • fullPath : String

    绝对路径

  • isDirectory : Boolean

    是否是 folder

  • isFile : Boolean

    是否是 file

  • name : String

    文件名

    ​

• methods

  • createWriter: (callback: (writer: FileWriter) => void) => void (FileEntry Only)

    写

    fileEntry.createWriter(function(fileWriter) {
      fileWriter.onwriteend = function(e) {
        // success todo...
      }
    
      fileWriter.onerror = function(e) {
        // fail todo...
      }
      
      fileWriter.write(new Blob(['...'],
      { type: 'text/plain;charset=UTF-8', endings: 'native' /* 'transparet' */ }
      ));
    
    }, errorHandler);

  • file: (callback: (file: File) => void) => void (FileEntry Only)

    读

    fileEntry.file(function(file: File) {
      const reader = new FileReader();
      reader.onloadend = function (e) {
    	// success todo...
      }
    
      reader.onerror = function (e) {
        // fail todo...
      }
    
      reader.readAsText(file);
    }, errorHandler);

  • copyTo: (dirEntry: DirectoryEntry, newName?: String, successCallback?, errorCallback?) => void

    复制

    root.getFile(filename, {}, function(fileEntry: FileEntry) {// get fileEntry
      root.getDirectory(dest, {}, function(dirEntry: DirectoryEntry) {// get dest dirEntry
        fileEntry.copyTo(dirEntry, newName, onsuccess, onerror));
      });
    });

  • moveTo: (dest: DirectoryEntry, newName?: String, successCallback?: (newEntry: FileEntry) => void, errorCallback?: (err) => void) => void

    剪切

    function rename(cwd: DirectoryEntry, src: String, newName: String) {
      cwd.getFile(src, {}, function(fileEntry) {
        fileEntry.moveTo(cwd, newName);
      }, errorHandler);
    }

  • createReader: DirectoryReader (DirectoryEntry Only)

    读文件夹

    const reader = root.createReader();
    reader.readEntries(function(results: Array<Entry>) {
      if (!results.length) {
        // is empty folder
      } else {
        const fileEntryList = results.filter(
          function(entry) { return entry.isFile; }
        );
    
        const directoryEntryList = results.filter(
          function(entry) { return entry.isDirectory; }
        );
      }
    });

  • getFile & getDirectory: (pathname: String, opts:{create?: Boolean, exclusive?: Boolean}, successCallback?: (fileEntry: FileEntry) => void, errorCallback?) => void (DirectoryEntry Only)

    创建、获取文件

    fs.root.getFile(src, {}, function(fileEntry: FileEntry) {
    
      fs.root.getDirectory(dirName, {}, function(dirEntry: DirectoryEntry) {
        fileEntry.moveTo(dirEntry);
      }, errorHandler);
    
    }, errorHandler);

  • toURL: String

    const img = new Image(fileEntry.toURL());
    document.body.append(img);

  • remove: (successCallback?: () => void, errorCallback?: (err: Error) => void) => void

    删

    fileEntry.remove(function() {
      // removed successfully...
    }, function(err) {
      // failed...
    });

  • getMetaData: (callback: (metadata: Metadata) => void) => void

    获取文件信息（最后变更时间、大小）

    fs.root.getFile('folderA/folderB/file.jpg', {}, function(fileEntry: FileEntry) {
      fileEntry.getMetaData(function(metadata: Metadata) {
        console.log(metadata);
      });
    }, errorHandler);

    ​

    ​