<!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <meta name="viewport" id="viewport" content="width=device-width,height=device-height,initial-scale=1.0,user-scalable=no"> <script src="json2.js" type="text/javascript"></script> <script src="phonegap.js" type="text/javascript"></script> <script type="text/javascript"> // invoked when device is ready function deviceInfo() { document.getElementById('window.device.phonegap').innerHTML = 'window.device.phonegap = ' + window.device.phonegap; } // register PhoneGap event listeners when DOM content loaded function init() { console.log('init()'); document.addEventListener("deviceready", deviceInfo, true); } // retrieves root file system entry var getFileSystemRoot = (function() { // private var root; // one-time retrieval of the root file system entry var init = function() { window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, function(fileSystem) { root = fileSystem.root; }, onFileSystemError); }; document.addEventListener("deviceready", init, true); // public function returns private root entry return function() { return root; }; }()); // execute immediately // file system error handler function onFileSystemError(error) { var msg = 'file system error: ' + error.code; navigator.notification.alert(msg, null, 'File System Error'); } // logs file events function onFileEvent(event) { console.log('file event: ' + event.target.fileName + ' ' + event.type); } // called when error reading file function onFileError(event) { console.log('file error: ' + event.target.error.code); } // called when file is written function onFileWrite(event) { onFileEvent(event); console.log('FileWriter position=' + event.target.position + ", length=" + event.target.length); } // writes a text file to the device function writeFile() { // root file system entry var root = getFileSystemRoot(), // writes a file write_file = function(writer) { var lineCount = 1; // set the callbacks writer.onwritestart = onFileEvent; writer.onprogress = onFileEvent; writer.onwrite = onFileWrite; writer.onabort = onFileEvent; writer.onerror = onFileError; writer.onwriteend = function(event) { onFileEvent(event); lineCount += 1; if (lineCount <= 3) { // append a new line writer.write('Line ' + lineCount + './r/n'); } else { alert(writer.fileName + ' length=' + writer.length + ', position=' + writer.position); } } // append writer.seek(writer.length); // write to file writer.write('Line ' + lineCount + './r/n'); }, // creates a FileWriter object create_writer = function(fileEntry) { fileEntry.createWriter(write_file, onFileSystemError); }; // create a file and write to it root.getFile('bbgap.txt', {create: true}, create_writer, onFileSystemError); } // remove file system entry function removeFile() { var root = getFileSystemRoot(); var remove_file = function(entry) { entry.remove(function() { navigator.notification.alert(entry.toURI(), null, 'Entry deleted'); }, onFileSystemError); }; // retrieve a file and truncate it root.getFile('bbgap.txt', {create: false}, remove_file, onFileSystemError); } </script> <title>File Create/Remove</title> </head> <body onload="init()"> <h3>window.device</h3> <p id="window.device.phonegap">[window.device.phonegap]</p> <input type="button" value="Write File" onclick="writeFile();return false;" /> <input type="button" value="Remove File" onclick="removeFile();return false;" /> </body> </html>
原创文章，作者：ItWorker，如若转载，请注明出处：https://blog.ytso.com/industrynews/13295.html