angular2 上传图片

    uploadImg(img: HTMLInputElement, code: any): void {

        if (this.imgs.length > 5) {

            alert("最多只能上传6张图片");

            return;

        }

        console.info(img.files[0]);

        let form = new FormData();

        form.append("img", img.files[0],img.files[0].name);

        // let newForm = new FormData(form[0]);

        this.commodityService.uploadImg(form, code)

            .then(data => {

                // this.imgurl = data.url;

                this.imgs.push(data.url);

            });

    }

 uploadImg(params: any,code:any): Promise<any> {

        return this.http.post("http://localhost:3000/bsp/bsp/bspmddata/item/addItemFiles?code="+code, params,{withCredentials: true})

            .toPromise()

            .then(

                res => {

                    return Promise.resolve(res.json() as any)

                }

            )

            .catch(this.handleError);

    }