javascript - 新数组属性未添加到 javascript 对象

Question

我有一个现有的空数组parentChildQuestions=[]。我想添加它来构建以下结构:

[
    {
        "id": "001",
        "childQuestions": [
            "002",
            "003"
        ]
    }
]

我有以下功能，但 childQuestions 属性似乎没有添加。我的日志根本没有显示它。

function addToDependentQuestions (thisQuestion) {
    if (parentChildQuestions.length===0) {
        var thisParent = parentChildQuestions.push({"id":thisQuestion.Parent_Question__c});
        thisParent.childQuestions=[thisQuestion.Id];

        console.log(thisParent.childQuestions);
    }
    else {
        var foundParentQuestion = $.grep(parentChildQuestions, function(e) { 
            return parentChildQuestions.Id == thisQuestion.Id;
        });
        foundParentQuestion.childQuestions.push(thisQuestion.Id);
    }

    console.log('parentChildQuestions' + JSON.stringify(parentChildQuestions));
}

Answer 1

var thisParent = parentChildQuestions.push({"id":thisQuestion.Parent_Question__c});

'array.push'不返回新添加的元素。它返回数组的新长度。

http://www.w3schools.com/jsref/jsref_push.asp