如何使用JavaScript將字段添加到數組的每一行？

Question

我有一個JavaScript變量：

var x = 
{"ab":"x",
 "cd":"y",
 "de":"z",
 "answers":[
    {"answerId":222,"answerUId":1,"text":"x"},
    {"answerId":223,"answerUId":2,"text":"A"},
    {"answerId":224,"answerUId":3,"text":"A"}
 ]
}

如何將一個值為null的字段添加到Answers數組的每個元素中？

Answer 1

您可以像這樣將新屬性添加到對象

x["answers"].forEach(function(currentObject) {
    currentObject["response"] = null;
});

這遍歷每個對象，並將response屬性添加到每個對象。

Answer 2

普通的javascript：

for (key in x['answers']) {
    x['answers'][key]['response'] = null;
}