Question

我有两个对象

function Response(dbResponseId, responseText){
    this.response = {
        "dbResponseId" : dbResponseId,
        "responseText" : responseText,
        "isDeleted" : false,

    };  

    this.setResponseText = function(responseText){
        this.response.responseText = responseText;
        return this.response;

    };

    this.getId = function(){
        return this.response.frontEndId;
    };
    this.deleted = function(){
        this.response.isDeleted = true;
    };
    return this.response; 
}

function OptionGroup(responses, dbOptionGroupId,isDeleted,id){
    this.optionGroup = {"dbOptionGroupId" : dbOptionGroupId, "responses" : responses, "isDeleted" : isDeleted,"frontEndId" : id};

    this.setResponses = function(responses){
        this.optionGroup.responses = responses;
        return this.optionGroup;
    };
    this.addResponse = function(response){
        this.optionGroup.responses.push(response);
        return this.optionGroup;
    };
    this.getId = function(){
        return this.optionGroup.frontEndId;
    };
    this.setId = function(id){
        this.optionGroup.frontEndId = id;
        return this.optionGroup;
    };
    this.deleted = function(){
        this.optionGroup.isDeleted = true;
        return this.optionGroup;
    };
    this.getResponsesById = function(id){
        for(var i = 0; i < this.optionGroup.responses.length;i++){
            if(id == this.optionGroup.responses[i].getId()){
                return this.optionGroup.responses[i];
            }
        }
        return null;
    };

    return this.optionGroup;
}

但是，当我尝试调用我创建的任何函数时，控制台告诉我所述对象没有这样的功能。当我在控制台中打印出Response或OptionGroup对象时，我可以看到对象中的字段，但是我看不到任何函数。

发生了什么事？

Answer 1

When you return something from an object used as a constructor, as the above code does, that value is the result of the new call.请注意，返回的对象（this.response和this.optionGroup）都没有您有兴趣调用的函数。

最简单的解决方案是删除return。

Answer 2

如果马特的答案很清楚，那就不知道了，但是：

> return this.optionGroup;

表示函数返回optionGroup对象，而不是this引用的新对象。

构造函数默认返回this，因此根本没有return语句等同于：

return this;

Response函数相同。

当然假设您使用new调用函数。

无法在javascript对象中创建函数

2 个答案: