使用此代码，您可以下载大图像，因为它们是由1MB的块写入的，而不是一次完成整个写入。没有1MB的写入，我将无法写入大于4MB的文件，但与此同时，我已经测试了最大40MB的文件，没有任何问题
window.resolveLocalFileSystemURL(cordova.file.externalDataDirectory, function (dirEntry) { console.log('file system open: ' + dirEntry.name); createFile(dirEntry, "downloadedImage.jpg"); }, onFSError); function onFSError(error) { alert(JSON.stringify(error)); } function createFile(dirEntry, fileName) { // Creates a new file or returns the file if it already exists. dirEntry.getFile(fileName, {create: true, exclusive: false}, function(fileEntry) { var xhr = new XMLHttpRequest(); xhr.open('GET', 'https://static.vix.com/es/sites/default/files/styles/large/public/imj/3/30-cosas-de-los-gatos-que-no-sabias-3.jpg', true); xhr.responseType = 'blob'; xhr.onload = function() { if (this.status == 200) { var blob = new Blob([this.response], { type: 'image/jpeg' }); writeFile(fileEntry, blob); } }; xhr.send(); }, onFSError); } function writeFile(fileEntry, data) { // Create a FileWriter object for our FileEntry (log.txt). fileEntry.createWriter(function (fileWriter) { fileWriter.onerror = function(e) { console.log("Failed file write: " + e.toString()); }; function writeFinish() { function success(file) { alert("Wrote file with size: " + file.size); } function fail(error) { alert("Unable to retrieve file properties: " + error.pre); } fileEntry.file(success, fail); } var written = 0; var BLOCK_SIZE = 1*1024*1024; // write 1M every time of write function writeNext(cbFinish) { fileWriter.onwrite = function(evt) { if (written < data.size) writeNext(cbFinish); else cbFinish(); }; if (written) fileWriter.seek(fileWriter.length); fileWriter.write(data.slice(written, written + Math.min(BLOCK_SIZE, data.size - written))); written += Math.min(BLOCK_SIZE, data.size - written); } writeNext(writeFinish); }); }
