nodejs：错误：回调不是函数

Question

I tried to do a callback because i need to call this function in another file but i dont undrestand what's wrong.

 calcul_energie =function(){
  Index.find(({date:{$gt:date_debut,$lt:date_fin}}),function(err, resulta){
  result=resulta;
   for(i=1;i<result.length;i++) 

        { Mesure.indexp1=result[i].indexp1;

             Mesure.energiep1=(( result[i].indexp1)-( result[i-1].indexp1));

             mesures=JSON.stringify(Mesure);

            return(mesures);
              }
              });

---

    var cal=function(pas_integration,callback)
     {
      return callback(pas_integration);

      };

---

   var calcule=function(date_deb, date_fin, pas)

    {

    var mesure_energie = require("./calcul.js");

    mesure_energie =cal(5,calcul_energie);
    console.log(mesure_energie);
    }

can you help please? thanks

Answer 1

You must pass function definition as a callback. Eg.

function myCallback(returnedMeasures) {
    // your code here
}

and use it to call your other function like this:

calcul(pas,myCallBack);

if that doesn't help please provide more complete example, including callback function definition and the way you call calcul(...) with that callback