Node.js 如何将常量值与api get请求一起发送到节点服务器

我有一个api服务，其中有一个通过节点服务器从mongo db获取数据的方法。但是我想发送

constuserplant=localStorage.getItem（“userplant”）的值以及对我的节点服务器中的get路由器的get请求，以便我可以使用WHERE条件过滤数据

API.SERVICE.TS

getStorageLocationsList(){
    this.setHeader();
    const userplant = localStorage.getItem("userplant"); //I Want to send this to the GET router
    return this.http.get(this.localURL + 'storagelocation/view', {headers:this.appHeader});
  }

router.get('/storagelocation/view', auth, function(req, res, next) {
    StorageLocation.find({plantId : "5dd262a61120910d94326cc1"}, function (err, events) {
      if (err) return next(err);
      res.json(events);
    });
  });

getStorageLocationsList(){
    this.setHeader();
    const userplant = localStorage.getItem("userplant"); //I Want to send this to the GET router
    return this.http.get(this.localURL + 'storagelocation/view' + '?userplant=' + userplant , {headers:this.appHeader});
  }

router.get('/storagelocation/view', auth, function(req, res, next) {
    let userplant = req.query.userplant;
    // you can use it now
    StorageLocation.find({plantId : "5dd262a61120910d94326cc1"}, function (err, events) {
      if (err) return next(err);
      res.json(events);
    });
  });

ROUTER.JS

getStorageLocationsList(){
    this.setHeader();
    const userplant = localStorage.getItem("userplant"); //I Want to send this to the GET router
    return this.http.get(this.localURL + 'storagelocation/view', {headers:this.appHeader});
  }

router.get('/storagelocation/view', auth, function(req, res, next) {
    StorageLocation.find({plantId : "5dd262a61120910d94326cc1"}, function (err, events) {
      if (err) return next(err);
      res.json(events);
    });
  });

getStorageLocationsList(){
    this.setHeader();
    const userplant = localStorage.getItem("userplant"); //I Want to send this to the GET router
    return this.http.get(this.localURL + 'storagelocation/view' + '?userplant=' + userplant , {headers:this.appHeader});
  }

router.get('/storagelocation/view', auth, function(req, res, next) {
    let userplant = req.query.userplant;
    // you can use it now
    StorageLocation.find({plantId : "5dd262a61120910d94326cc1"}, function (err, events) {
      if (err) return next(err);
      res.json(events);
    });
  });

我想在
{plantId:“here”}

注意：我的get请求工作正常，我只想将常量值与之一起发送…
在您可以发送的查询参数中

getStorageLocationsList(){
    this.setHeader();
    const userplant = localStorage.getItem("userplant"); //I Want to send this to the GET router
    const params = new HttpParams().set('userplant ',userplant);
    return this.http.get(this.localURL + 'storagelocation/view', {headers:this.appHeader, params: params});
}

您可以使用queryParams执行以下操作：

API.SERVICE.TS

getStorageLocationsList(){
    this.setHeader();
    const userplant = localStorage.getItem("userplant"); //I Want to send this to the GET router
    return this.http.get(this.localURL + 'storagelocation/view', {headers:this.appHeader});
  }

router.get('/storagelocation/view', auth, function(req, res, next) {
    StorageLocation.find({plantId : "5dd262a61120910d94326cc1"}, function (err, events) {
      if (err) return next(err);
      res.json(events);
    });
  });

getStorageLocationsList(){
    this.setHeader();
    const userplant = localStorage.getItem("userplant"); //I Want to send this to the GET router
    return this.http.get(this.localURL + 'storagelocation/view' + '?userplant=' + userplant , {headers:this.appHeader});
  }

router.get('/storagelocation/view', auth, function(req, res, next) {
    let userplant = req.query.userplant;
    // you can use it now
    StorageLocation.find({plantId : "5dd262a61120910d94326cc1"}, function (err, events) {
      if (err) return next(err);
      res.json(events);
    });
  });

ROUTER.JS

getStorageLocationsList(){
    this.setHeader();
    const userplant = localStorage.getItem("userplant"); //I Want to send this to the GET router
    return this.http.get(this.localURL + 'storagelocation/view', {headers:this.appHeader});
  }

router.get('/storagelocation/view', auth, function(req, res, next) {
    StorageLocation.find({plantId : "5dd262a61120910d94326cc1"}, function (err, events) {
      if (err) return next(err);
      res.json(events);
    });
  });

getStorageLocationsList(){
    this.setHeader();
    const userplant = localStorage.getItem("userplant"); //I Want to send this to the GET router
    return this.http.get(this.localURL + 'storagelocation/view' + '?userplant=' + userplant , {headers:this.appHeader});
  }

router.get('/storagelocation/view', auth, function(req, res, next) {
    let userplant = req.query.userplant;
    // you can use it now
    StorageLocation.find({plantId : "5dd262a61120910d94326cc1"}, function (err, events) {
      if (err) return next(err);
      res.json(events);
    });
  });

在Angular中进行以下更改，可以像这样传递标题和参数：

const httpOptions = {
        headers: { 'Content-Type': 'application/json' },
        params: {userplant:userplant}
    };
getStorageLocationsList(){
    this.setHeader();
    const userplant = localStorage.getItem("userplant"); 
    return this.http.get(this.localURL + 'storagelocation/view',httpOptions);
  }

在NodeJS中进行以下更改，您必须使用body解析器

router.get('/storagelocation/view', auth, function(req, res, next) {
    var plantId=req.body.plantId;
    StorageLocation.find({plantId : plantId}, function (err, events) {
      if (err) return next(err);
      res.json(events);
    });
  });