How to loop a simple object?

This question already has an answer here:

How to loop through a plain JavaScript object with the objects as members? 17 answers

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It looks like you are trying to get the length of an object, which you can't do. The following should give you what you want.

var links = {
  "0": {
    "fromOperator": "operator2",
    "fromConnector": "output_0",
    "fromSubConnector": 0,
    "toOperator": "operator1",
    "toConnector": "input_0",
    "toSubConnector": 0
  },
  "1": {
    "fromOperator": "operator2",
    "fromConnector": "output_0",
    "fromSubConnector": 0,
    "toOperator": "operator0",
    "toConnector": "input_0",
    "toSubConnector": 0
  }
}

for(var i = 0; i < Object.keys(links).length; i++) {
    var fromConnector = links[i].fromConnector;
    var toConnector = links[i].toConnector;
    console.log("FROM: " + fromConnector + " ..... TO: " + toConnector);
}

Note, I updated the limit in the for loop to Object.keys(links).length .

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用一个带有键的对象，从frm零开始并继续键，你可以创建一个数组ald迭代它。

var links = { 0: { fromOperator: "operator2", fromConnector: "output_0", fromSubConnector: 0, toOperator: "operator1", toConnector: "input_0", toSubConnector: 0 }, 1: { fromOperator: "operator2", fromConnector: "output_0", fromSubConnector: 0, toOperator: "operator0", toConnector: "input_0", toSubConnector: 0 } };

Object
    .assign([], links)
    .forEach(({ fromConnector , toConnector }) =>
        console.log("FROM: " + fromConnector + " ..... TO: " + toConnector));

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