uni-app中单张图片上传

addPic : function(){
                let token = this.token()
                let url = "路径";
                var that = this;
                uni.chooseImage({
                    count: 1,
                    sizeType: ['original', 'compressed'], //可以指定是原图还是压缩图，默认二者都有
                    sourceType: ['album','camera'], //从相册选择
                    success: function (res) {
                        const tempFilePaths = res.tempFilePaths;
                        //图片上传
                        const uploadTask = uni.uploadFile({
                            url : url,
                            filePath: tempFilePaths[0],
                            name: 'head_img',
                            success: function (uploadFileRes) {
                                const back = JSON.parse(uploadFileRes.data);
                                //图片显示赋值
                                that.personData.head_img = back.data
                            }
                        });
                    },
                    error : function(e){
                        console.log(e);
                    }
               });
            },