Array.push无法在Node.js中使用对象

Question

How can I add an object as an entry to an array, like I'm trying to do here...

 displayAccounts(function(data){
    var index;
    var accs = new Array();
    for (index = 0; index < data.length; ++index) {
      rclient.get(data.account, function (info) {
        accs.push({
            account: data.account,
            info: info
          });
      });
    }
    console.log(accs);
  });

Output:

accs = []

Desired solution:

accs = [{account: 'jak', info: 0},{account: 'jil', info: 1}]

Answer 1

The problem is almost certainly that rclient.get is asynchronous , so examining the array after your loop is examining it too soon (the gets have been started , but they haven't finished yet); it will get filled in by callbacks that occur asynchronously. Wait until the last callback has occurred, eg:

displayAccounts(function(data){
    var index;
    var accs = []; // [] is a better way to write new Array()
    for (index = 0; index < data.length; ++index) 
        rclient.get(data.account, function (info) {
            accs.push({
                account: data.account,
                info: info
            });
            if (accs.length === data.length) {
                // We're done, *now* look at / use the array
                console.log(accs);
            }
        });
    }
});

Note that depending on how rclient.get works, the callbacks may or may not occur in the same order as the requests.

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Side note: That rclient.get(data.account, ... looks suspicious, you're repeatedly requesting the same information. Perhaps rclient.get(data[index].account, ... ?