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ローカルに保存し、Ajax 呼び出しを使用して取得した画像を Cordova で表示しようとしています。ここに私のソース：

<!DOCTYPE html>
<!--
    Licensed to the Apache Software Foundation (ASF) under one
    or more contributor license agreements.  See the NOTICE file
    distributed with this work for additional information
    regarding copyright ownership.  The ASF licenses this file
    to you under the Apache License, Version 2.0 (the
    "License"); you may not use this file except in compliance
    with the License.  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing,
    software distributed under the License is distributed on an
    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
     KIND, either express or implied.  See the License for the
    specific language governing permissions and limitations
    under the License.
-->
<html>
    <head>
        <meta charset="utf-8" />
        <meta name="format-detection" content="telephone=no" />
        <meta name="viewport" content="user-scalable=no, initial-scale=1, maximum-scale=1, minimum-scale=1, width=device-width, height=device-height, target-densitydpi=device-dpi" />
        <link rel="stylesheet" type="text/css" href="css/index.css" />

        <title>Test requestFileSystem</title>
    </head>
    <body>
        <div class="app">
            <h1>Apache Cordova</h1>
            <div id="deviceready" class="blink">
                <p class="event listening">Connecting to Device</p>
                <p class="event received">Device is Ready</p>
            </div>
        </div>
        <script type="text/javascript" src="cordova.js"></script>
        <script type="text/javascript" src="js/index.js"></script>
        <script type="text/javascript">
            app.initialize();
        </script>

    </body>
</html>
<script>
    window.requestFileSystem  = window.requestFileSystem || window.webkitRequestFileSystem;

    function onError(e) {
        console.log('Error', e);
    }

    var xhr = new XMLHttpRequest();
    xhr.open('GET', 'http://upload.wikimedia.org/wikipedia/fr/2/26/10_francs_Mathieu_1987_F365-28_revers.jpg', true);
    xhr.responseType = 'blob';

    window.onload = function() {
        document.addEventListener("deviceready", start, false);
    }

    function start() {
        alert("dans start : deviceready fired");
        xhr.send();
    }

    xhr.onload = function(e) {
        alert("xhr.onload");
        doProcess();
    }

    function doProcess() {
        alert('dans doProcess');
        window.requestFileSystem(PERSISTENT, 1024 * 1024, function(fs) { // here
            alert('dans requestFileSystem 1 success');
            fs.root.getFile('image.jpg', {create: true}, function(fileEntry) {
                alert('dans getFile 1 success');
                fileEntry.createWriter(function(writer) {
                    alert('dans createWriter');
                    writer.onwrite = function(e) {};
                    writer.onerror = function(e) {};

                    var blob = new Blob([xhr.response], {type: 'image/jpeg'});

                    writer.write(blob);

                }, function(e) {
                    console.log('Error', e);
                });
            }, function(e) {
                console.log('Error', e);
            });
        }, function(e) {
            alert('error');
            console.log('Error', e);
        });

        window.requestFileSystem(PERSISTENT, 1024 * 1024, function(fs) {
            alert('dans reqestFileSystem 2 success');
            fs.root.getFile('image.jpg', {create: false}, function(fileEntry) {
                fileEntry.file(function(file) {
                    alert('dans file');
                    var reader = new FileReader();
                    reader.onloadend = function(event) {
                        var img = document.createElement("img");
                        img.src = event.target.result;

                        document.body.parentNode.insertBefore(img, document.body.nextSibling);
                    };
                    reader.readAsDataURL(file);
                }, function(e) {
                    console.log('Error', e);
                });
            }, function(e) {
                console.log('Error', e);
            });
        }, function(e) {
            console.log('Error', e);
        });

    };

    //xhr.send();</script>

問題は、最初の window.requestFileSystem 呼び出し (「here」とコメントされている) の成功関数が呼び出されないようです。エラー関数も呼び出されません。「dans doProcess」アラートが表示された後、何も起こりません。XCode と iOS シミュレーターでテストしています。何か案が？

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