如何在JavaScript中调用数组时使用变量作为键进行调用

Question

this works

for (var i=1; i<=queueconf.limit; i++)
{

  var filename=queueconf['jobs']['queue1']['name'];
}

but, this does not work

for (var i=1; i<=queueconf.limit; i++)
{

  //as queue+i
  var filename=queueconf['jobs']['queue'+i]['name'];

  var qfile=require("./jobs/"+filename);
}

why? error : TypeError: Cannot read property 'name' of undefined

it sees an error like above code

Answer 1

It is possible that not all queues ( queues1 to queuesn ) are available in queueconf['jobs'] .

try this fail-safe

for (var i=1; i<=queueconf.limit; i++)
{
  var queue = queueconf['jobs']['queue'+i];
  if ( queue )
  {
    var filename = queue['name'];
    var qfile = require("./jobs/"+filename);
  }
}