javascript - 函数不会推送到空数组来创建列表。如何解决这个问题

Question

我正在尝试通过函数调用将项目添加到爱好列表中。但它没有添加，我一直在得到空数组。我想念一些愚蠢的东西。你能指导我解决这个问题吗？我包括我正在处理的所有代码。

我试过像这样调用函数。person().addHobby('TestHobby');

function person(firstName, lastName) {

    var FullName = firstName + ' ' + lastName;
    var hobbies = [‘’];

    return {

        /**
         * Returns truthy if the person already has this hobby
         * @param {string} hobby
         * @returns {boolean}
         */
        hasHobby: function(hobby) {
            return hobbies.indexOf(hobby)>=0;
        },

        /**
         * Returns the person's hobbies after adding the given hobby
         * @param {string} hobby
         * @returns {array}
         */
        addHobby: function(hobby) {
            return hobbies.indexOf(hobby)>0 ? hobbies : hobbies.push(hobby);
        },

        /**
         * Returns the person's hobbies after removing the given hobby
         * @param {string} hobby
         * @returns {array}
         */
        removeHobby: function(hobby) {
            if (hobbies.indexOf(hobby)>0) {
                // note: filter is a standard array function that creates a new array
                // with all elements that pass the test implemented by the provided function
                hobbies = hobbies.filter(function(hobby) { 
                    return hobby != hobby;
                });
                return hobbies;
            } else {
                return hobbies;
            }
        },

        /**
         * Returns the person's hobbies
         * @returns {array}
         */
        getHobbies: function() {
            return hobbies
        },

        /**
         * Returns the person's full name
         * @returns {string}
         */
        getName: function() {
            return FullName;
        },

  };
};

Answer 1

也许您不确定您在这里实际创建了什么。这是人的类定义。要调用它的方法，您需要创建一个新的 person 实例，例如:

var gregory=new person();

gregory 是您对新创建的人的引用。给格雷戈里一个爱好:

gregory.addHobby("sleeping");

现在您可以查询他的爱好，例如:

console.log(gregory.getHobbies());