我需要上传一个图像到NodeJS服务器到某个目录。我使用connect-busboy节点模块。
我有图像的dataURL，我转换为blob使用以下代码:
dataURLToBlob: function(dataURL) {
var BASE64_MARKER = ';base64,';
if (dataURL.indexOf(BASE64_MARKER) == -1) {
var parts = dataURL.split(',');
var contentType = parts[0].split(':')[1];
var raw = decodeURIComponent(parts[1]);
return new Blob([raw], {type: contentType});
}
var parts = dataURL.split(BASE64_MARKER);
var contentType = parts[0].split(':')[1];
var raw = window.atob(parts[1]);
var rawLength = raw.length;
var uInt8Array = new Uint8Array(rawLength);
for (var i = 0; i < rawLength; ++i) {
uInt8Array[i] = raw.charCodeAt(i);
}
return new Blob([uInt8Array], {type: contentType});
}
我需要一种方法来把团到一个文件上传图像。
有人能帮我一下吗?
打印稿
public blobToFile = (theBlob: Blob, fileName:string): File => {
return new File(
[theBlob as any], // cast as any
fileName,
{
lastModified: new Date().getTime(),
type: theBlob.type
}
)
}
Javascript
function blobToFile(theBlob, fileName){
return new File([theBlob], fileName, { lastModified: new Date().getTime(), type: theBlob.type })
}
输出
File {name: "fileName", lastModified: 1597081051454, lastModifiedDate: Mon Aug 10 2020 19:37:31 GMT+0200 (Eastern European Standard Time), webkitRelativePath: "", size: 601887, …}
lastModified: 1597081051454
lastModifiedDate: Mon Aug 10 2020 19:37:31 GMT+0200 (Eastern European Standard Time) {}
name: "fileName"
size: 601887
type: "image/png"
webkitRelativePath: ""
__proto__: File
我已经使用FileSaver.js将blob保存为文件。
这是回购:https://github.com/eligrey/FileSaver.js/
用法:
import { saveAs } from 'file-saver';
var blob = new Blob(["Hello, world!"], {type: "text/plain;charset=utf-8"});
saveAs(blob, "hello world.txt");
saveAs("https://httpbin.org/image", "image.jpg");
