错误信息：
Failed to load http://localhost:9000/partner/upload: Response to preflight request doesn't pass access control check: The value of the 'Access-Control-Allow-Origin' header in the response must not be the wildcard '*' when the request's credentials mode is 'include'. Origin 'http://localhost:8888' is therefore not allowed access. The credentials mode of requests initiated by the XMLHttpRequest is controlled by the withCredentials attribute.
错误原因：浏览器不允许发送凭据和通配符源的组合。
解决办法1：
修改项目中的\node_modules\ng2-file-upload\file-upload\file-uploader.class.js源码,
注释掉第277行：
//xhr.withCredentials = item.withCredentials;
解决办法2：
this.uploader.onAfterAddingFile = (file) => { file.withCredentials = false; };
例如：
......
import { FileUploader } from 'ng2-file-upload';
// const URL = '/api/';
const URL = 'http://localhost:9000/partner/upload';
@Component({
selector: 'partner-form',
templateUrl: './partner-form.component.html',
styleUrls: ['./partner-form.css']
})
export class PartnerFormComponent implements OnInit {
public uploader:FileUploader = new FileUploader({url: URL});
public hasBaseDropZoneOver:boolean = false;
public hasAnotherDropZoneOver:boolean = false;
public fileOverBase(e:any):void {
this.hasBaseDropZoneOver = e;
}
public fileOverAnother(e:any):void {
this.hasAnotherDropZoneOver = e;
}
constructor(private route: ActivatedRoute, private partnerService: PartnerService) {
......
}
/**
* 初始化方法
*/
ngOnInit() {
this.uploader = new FileUploader({
url: URL,
method: "POST",
itemAlias: "myuploader"
});
this.uploader.onAfterAddingFile = (file) => { file.withCredentials = false; };
}
......
}
详情请参考ng2-file-upload官方的issue：
https://github.com/valor-software/ng2-file-upload/issues/1018