phonegap_remove_file.js

var onFileSystemError = function onFileSystemError() {
    alert('the was an error during access to filesystem');
};
var remove_file = function(entry) {
    entry.remove(function() {
        self.model.remove();
        self.model.set('synced',false);
        self.render();
    }, onFileSystemError);
};
window.requestFileSystem(window.LocalFileSystem.PERSISTENT, 0,
    function(fileSystem) {
        var root = fileSystem.root;
        // retrieve a file and truncate it
        root.getFile(filePath, {create: false}, remove_file, onFileSystemError);
    },
    onFileSystemError
);