uni.uploadFile 在电脑版微信上无法上传 返回uploadFile: fail

            uni.uploadFile({  
                url: this.$base.urlPrex + "/api/",  
                filePath: this.tempImgSrc,  
                name: 'verifyFace',  
                formData: {  
                    'username': 'uu',  
                    'phone': '13698936320',   
                    'u': randomNum,   
                    'tk': token,  
                    'state': 3656,  
                    'tpsId': 'md_wcjy'  
                },  
                success: (uploadFileRes) => {  
                    uni.hideToast()  
                },  
                fail: (err) => {  
                    console.log(err)  
                },  
            });