Question

请转到此代码的第60行或（此变量位于for循环内的Amit），我想要该变量名导出到另一个文件中，但是我不能使用tat可变值来其他文件。当我通过要求它显示未定义来做到这一点时。

class FetchData {

    constructor(device_id, header) {
        this.device_id = device_id;
        this.header= header;
    }

    services() {
        // Get Device Details by deviceId
        return httpRequest({ 
            method  : 'get', 
            json    : true,
            url     : `${config.url.usermgmt_api}/device/${this.device_id}`,
            headers : { 'x-access-token': this.header }
        }).then( response => {
            if(response.hasOwnProperty('auth') && !response.auth) {
                throw new Error(response.message);
            }
            let thingGreenLinks = [];

            // Current Active TG into the Array
            if(response.hasOwnProperty('mapping')) {
                //We have to scroll through the mapping and return the shortcode and thingid and ports to connect
                thingGreenLinks.push(response.mapping[0].TG_Port.split(/_/)[0]);    
            } else {
                throw (response.message)? response.message : 'No mapping found. Device ID: '+ deviceid;
            }


            // Check mapping history 
            if(response.hasOwnProperty('map_history') && response.map_history.length > 0) {
                response.map_history.reverse().map( record => { 
                    thingGreenLinks.push(record.mapping[0].TG_Port.split(/_/)[0]) 
                })
            }
            return thingGreenLinks;
        }).then(async tg_ids => {
            logger.info('Fetching Hardware IDs of ThingGreen ...');
            let Hardware_IDs = [];

            for (let i = 0; i <= tg_ids.length - 1; i++) {
                await fetchHardwareID(tg_ids[i], this.header)
               .then( response => { Hardware_IDs.push(response.HardwareId) })

               let Amit = 'amit'
             module.exports = { amit : Amit}

            }
            logger.info('Received Following Hardware IDs :\n'+Hardware_IDs.join('\n'));
            return Hardware_IDs;
        })
        .catch( err => Promise.reject(new Error(err.message)));
    } } exports.FetchData = FetchData;

列表项

Answer 1

您可以在班级中拥有一个变量，在您的服务函数中为其赋值

class FetchData {

    constructor(device_id, header) {
        this.device_id = device_id;
        this.header= header;
        this.amit = "";
     }

   services() {
       //your sevices code
       this.amit='amit'
     }


} exports.FetchData = FetchData;

然后在另一个导入FetchData的文件中，可以使用object.varible名称进行访问。

    var fetchDataObject = new FetchData(device_id, header);
     fetchDataObject.amit //this is your variable amit

如何将此变量从类方法导出到另一个文件？

1 个答案: