Javascript 在UWP web上下文中保存文件

我最近开发了一个带有UWP web上下文（JavaScript和HTML）的Windows 10通用应用程序，我想保存一个文本文件。它在浏览器（Chrome、Firefox、Edge等）上运行良好，但在应用程序中不起作用。 有人能帮我吗？：） 提前谢谢你

下面是负责保存文本文件的代码

function saveTextAsFile(fileName) {
var source = input.value.replace(/\n/g, "\r\n");
var fileUrl = window.URL.createObjectURL(new Blob([source], {type:"text/plain"}));
var downloadLink = createDownloadLink(fileUrl, fileName);

document.body.appendChild(downloadLink);
downloadLink.click();
document.body.removeChild(downloadLink);}

---

要使用渐进式Web应用程序作为通用Windows平台下载文件，您可以使用

Windows

全局对象和

FileSavePicker

。注意，您可以使用

if（window['Windows']！=null）{…}

// Create the picker object and set options
var savePicker = new Windows.Storage.Pickers.FileSavePicker();
savePicker.suggestedStartLocation = Windows.Storage.Pickers.PickerLocationId.documentsLibrary;
// Dropdown of file types the user can save the file as
savePicker.fileTypeChoices.insert("Plain Text", [".txt"]);
// Default file name if the user does not type one in or select a file to replace
savePicker.suggestedFileName = "New Document";

savePicker.pickSaveFileAsync().then(function (file) {
    if (file) {
        // Prevent updates to the remote version of the file until we finish making changes and call CompleteUpdatesAsync.
        Windows.Storage.CachedFileManager.deferUpdates(file);
        // write to file
        Windows.Storage.FileIO.writeTextAsync(file, fileContents).done(function () {
            // Let Windows know that we're finished changing the file so the other app can update the remote version of the file.
            // Completing updates may require Windows to ask for user input.
            Windows.Storage.CachedFileManager.completeUpdatesAsync(file).done(function (updateStatus) {
                if (updateStatus === Windows.Storage.Provider.FileUpdateStatus.complete) {
                    WinJS.log && WinJS.log("File " + file.name + " was saved.", "sample", "status");
                } else {
                    WinJS.log && WinJS.log("File " + file.name + " couldn't be saved.", "sample", "status");
                }
            });
        });
    } else {
        WinJS.log && WinJS.log("Operation cancelled.", "sample", "status");
    }
});

这假定您正在下载一个文本文件。要下载

Uint8Array

请改用

FileIO

上的

WriteBytesAsync

功能。请注意，

FileIO

上的许多函数在JavaScript中可用，即使它们不适用于JavaScript

查看以获取更多信息。

查看以及如何在那里保存文件。我不能使用C方法，这不是C方法-它是WinRT方法。您可以从JavaScript调用WinRT API。例如，见