javascript Phonegap - 在第一次加载时创建一个 .txt 文件

Phonegap - Creating a .txt file on first load

提问by Raj Labana

I am creating a phonegap app and need to create a new .txt file on first load. After this I need to check whether the file exists and then ignore the creation if that is the case, below is the general flow that I am after:

我正在创建一个 phonegap 应用程序，需要在第一次加载时创建一个新的 .txt 文件。在此之后，我需要检查文件是否存在，如果是这种情况，则忽略创建，以下是我所追求的一般流程：

1 - onDeviceReady - loading phoengap app 2 - Check is readme.txt exist (if yes load home page) 3 - Create a file readme.txt and add to www folder 4 - Continue loading homepage

1 - onDeviceReady - 加载 phoengap 应用程序 2 - 检查 readme.txt 是否存在（如果是，加载主页） 3 - 创建一个文件 readme.txt 并添加到 www 文件夹 4 - 继续加载主页

EDIT - Rather than the valid answer mentioned below I decided to use HTML5s local storage as this was simply 1 line of code.

编辑 - 而不是下面提到的有效答案，我决定使用 HTML5s 本地存储，因为这只是 1 行代码。

localStorage.setItem("name", "Email Supplied!");

and can be checked using this simple if statement

并且可以使用这个简单的 if 语句进行检查

 if (localStorage.getItem("name") == "Email Supplied!")
        {
            // What you want to happen here
        }

采纳答案by Titouan de Bailleul

You can take a look at the full example here:

您可以在此处查看完整示例：

http://docs.phonegap.com/en/1.4.1/phonegap_file_file.md.html#FileWriter

http://docs.phonegap.com/en/1.4.1/phonegap_file_file.md.html#FileWriter

This line create the file if it doesn't exist :

如果文件不存在，此行将创建文件：

fileSystem.root.getFile("readme.txt", {create: true, exclusive: false}, gotFileEntry, fail);

Supported Platforms

Android BlackBerry WebWorks (OS 5.0 and higher) iOS Windows Phone 7 ( Mango )

支持的平台

Android BlackBerry WebWorks（OS 5.0 及更高版本） iOS Windows Phone 7 (Mango)

I don't know about there others but in iOS, the document is created in /var/mobile/Application/YOU_APP/Documents

我不知道其他人，但在 iOS 中，文档是在 /var/mobile/Application/YOU_APP/Documents 中创建的

[CODE]

[代码]

        <script type="text/javascript" charset="utf-8">

            // Wait for PhoneGap to load
            //
            document.addEventListener("deviceready", onDeviceReady, false);

            // PhoneGap is ready
            //
            function onDeviceReady() {
                window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, gotFS, fail);
            }

            function gotFS(fileSystem) {
                fileSystem.root.getFile("readme.txt", {create: true}, gotFileEntry, fail);
            }

            function gotFileEntry(fileEntry) {
                fileEntry.createWriter(gotFileWriter, fail);
            }

            function gotFileWriter(writer) {
                writer.onwrite = function(evt) {
                    console.log("write success");
                };

                writer.write("some sample text");
                writer.abort();
                // contents of file now 'some different text'
            }

            function fail(error) {
                console.log("error : "+error.code);
            }

        </script>

Hope it helps

希望能帮助到你

回答by Aidan

Depending on the devices you are developing for you can look at using their native file creation APIs. For example, iOS uses plists. Android does use .txt files, look at this linkfor more information.

根据您正在开发的设备，您可以考虑使用它们的原生文件创建 API。例如，iOS 使用 plist。Android 确实使用 .txt 文件，查看此链接了解更多信息。