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我尝试在 Cordova 中本地存储并显示我使用 Ajax 调用检索到的图像。这是我的来源：

<!DOCTYPE html>
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    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

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    "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.
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<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>

问题是，似乎从未调用过第一个 window.requestFileSystem 调用（注释为“here”）的成功函数。也没有调用错误函数。显示我的“dans doProcess”警报，然后什么也没有发生。我正在使用 XCode 和 iOS 模拟器进行测试。任何想法？

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