Question

我已经在nodeJs中编写了这段代码：

function ricarica() {

   request.get(url, function (error, response, body) {
       if (!error && response.statusCode == 200) {
           var json = JSON.parse(body);
           //console.log(json[11].nome_abbr);
           //console.log(json[11].valore); 

            app.use(function(req, res, next) {
                res.header("Access-Control-Allow-Origin", "*");
                res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
                next();
            });

            app.get('/valore', function(req, res){
            res.json({ livello: json[11].valore }); 
            });     
        }
   });
}

我想每10分钟运行一次该函数，我已经看过setInterval，但是当我替换它时：

ricarica();

与此：

 setInterval(function() {
     ricarica();
 }, 600000);

当我从我的网站上请求数据时，第一个我可以看到数据，但是它没有更新，第二个我收到消息“ Cannot GET / valore”；

我如何获取数据并每10分钟更新一次？

Answer 1

尝试一下：

function updateData() {
   ricarica();
}

function ricarica() {

   request.get(url, function (error, response, body) {
       if (!error && response.statusCode == 200) {
           var json = JSON.parse(body);
           //console.log(json[11].nome_abbr);
           //console.log(json[11].valore); 

            app.use(function(req, res, next) {
                res.header("Access-Control-Allow-Origin", "*");
                res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
                next();
            });

            app.get('/valore', function(req, res){
            res.json({ livello: json[11].valore }); 
            });     
        }
   });
}

setInterval ( updateData, 600000 );

Answer 2

我已在此模式下解决：

async function ricarica() {
while(true){
    await sleep(120000);
    request.get(url, function (error, response, body) {
        if (!error && response.statusCode == 200) {
            var json = JSON.parse(body);
            var i;
            for(i = 0; i< json.length && json[i].nome_abbr != "PS_Giud" ; i++);
            console.log(json[i].nome_abbr);
            //console.log(json[i].valore); 

            app.use(function(req, res, next) {
                res.header("Access-Control-Allow-Origin", "*");
                res.header("Access-Control-Allow-Headers", "Accept, Content-Type, If-None-Match, X-If-None-Match");
                res.header("Access-Control-Expose-Headers", "Location, Warning, Etag");
                res.header("Access-Control-Allow-Headers", "Content-Type, If-None-Match, X-If-None-Match, Authorization");
                res.header("Access-Control-Allow-Methods", "POST, GET, DELETE, OPTIONS");

                next();
            });

            app.get('/valore', function(req, res, next){
              res.json({ livello: json[i].valore }); 
            });     
        }
    });
}

}

我只需要调用一次

将函数放入setInterval（）

2 个答案: