nvue中引入es7语法文件报错

export const request = async (url, method, data={}, header = {}) => {  
    let defaultHeader = {  
        'xxxx': 'xxxxx',  
    }  
    try {  

        return new Promise((resolve, reject) => {  
            uni.request({  
                url,  
                method: method.toUpperCase(),  
                data,  
                header: {  
                    ...defaultHeader,  
                    ...header  
                },  
                success: ({  
                    data: res,  
                    statusCode  
                }) => {  
                    let result = {  
                        status:statusCode  
                    }  
                    if(statusCode>200){  
                        result = {  
                            ...result,  
                            ...res  
                        }  
                    }else {  
                        result = {  
                            ...result,  
                            data:res,  
                        }  
                    }  
                    switch (statusCode) {  
                        case 200:  
                            resolve(result)  
                            break;  
                        case 401:  
                            uni.showToast({  
                                icon: 'none',  
                                title: 'please login again！'  
                            })  
                            reject(result)  
                            break  
                        default:  
                            uni.showToast({  
                                icon: 'none',  
                                title: result.message || 'request failed！'  
                            });  
                            reject(result)  
                            break;  
                    }  

                },  
                fail: err => {  
                    console.log(`FAIL:${JSON.stringify(err)}`)  
                    reject(err)  
                }  
            })  
        })  
    } catch (err) {  
        console.log(`ERROR:${JSON.stringify(err)}`)  
        throw err  
    }  
}