[英]Cannot read property “…” of undefined
在server.js代码中,我在一开始就写过:
var callForecastDatas = require(__dirname+"/config/callForecastDatas.js");
var callForecastAdsl = require(__dirname+"/config/callForecastAdsl.js");
var callForecastCable = require(__dirname+"/config/callForecastCable.js");
var callForecastFibre = require(__dirname+"/config/callForecastFibre.js");
var callForecastOthers = require(__dirname+"/config/callForecastOthers.js");
var callForecastOtt = require(__dirname+"/config/callForecastOtt.js");
var callForecastSatellite = require(__dirname+"/config/callForecastSatellite.js");
var callForecasttnt = require(__dirname+"/config/callForecasttnt.js");
然后,在一个函数中,我引用了其中一个元素:
function getAllDeptsCallForecast(res, queryParams)
{
//some code
var callForecastAdsl = callForecastAdsl.callForecastPerHourAndPerDay;
//some code
}
/config/callForecastAdsl.js文件的结构如下:
module.exports = {
callForecastPerHourAndPerDay:`...some datas...
};
为什么我会有这样的错误500(参考函数GetAllDeptsCallForecast中带有callForecastAdsl的行)?
TypeError: Cannot read property 'callForecastPerHourAndPerDay' of undefined
您正在隐藏变量:
function getAllDeptsCallForecast(res, queryParams)
{
var callForecastAdsl = callForecastAdsl.callForecastPerHourAndPerDay;
// ^^^^--- This is shadowing the imported `callForecastAdsl`
}
这意味着您的require
中的callForecastAdsl
在该函数中不可用,只有其本地callForecastAdsl
变量可用,该变量的初始值为undefined
。
只需使用其他名称即可:
function getAllDeptsCallForecast(res, queryParams)
{
var someOtherName = callForecastAdsl.callForecastPerHourAndPerDay;
// ^^^^^^^^^^^^^
}
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