Question

假设我有一个对象数组，我希望它们有时可以作为哈希访问（更改它们的值，呃？），有时打印。

var test = { members : [] };
test.addMember = function(name, value) { 
    this.members[name] = { name : name, value : value }; 
    this.members[name].toString = function() { 
        return this.name + " has a " + this.value; };
};
test.toString = function() { 
    return this.members.join(" and ");
};
test.addMember("a", "a value");
test.addMember("b", "b value");
alert(test);

我的目标是让test.toString（）返回：

a has a value and b has b value

或者你有什么。我正在阅读MDN，似乎JavaScript 1.8.5（或某些子目标）将有一个调用toString（）的join（）。我被困了吗？

谢谢！

编辑：这是我的最终设计，包括修改和删除功能（如果有人好奇的话）！

var test = { 
    members : [],
    modifyMember : function(name, value) {
        var index = this.members.indexOf(this.members[name]);
        if(index < 0) {
            return;
        }
        this.members[index].value = this.members[name].value = value;
    },
    addMember : function(name, value) { 
        if(this.members[name]) { 
            this.modifyMember(name, value);
            return;
        }
        this.members[name] = { 
            name : name, 
            value : value,
            toString : function() { 
                return this.name + " has " + this.value; 
            },
        }; 
        this.members.push(this.members[name]);
    },
    removeMember : function(name) { 
        if(!this.members[name]) return;
        this.members.splice(this.members.indexOf(this.members[name]), 1);
        delete this.members[name];
    },
    toString : function() {
        return this.members.join(" AND ");
    } 
};

Answer 1

您已经在使用属性扩展数组。现在，不要忘记填充您的数组。使用Array.push()：

test.addMember = function(name, value) { 
    this.members[name] = { name : name, value : value }; 
    this.members.push(this.members[name]);
    ...
};

Answer 2

一种方法是:(成员是一个对象）

var test = { members : {} };
test.addMember = function(name, value) { 
    this.members[name] = { name : name, value : value }; 
    this.members[name].toString = function() { 
        return this.name + " has a " + this.value; };
};
test.toString = function() {
    var arr=[];
    for(var i in this.members) {
        if (this.members.hasOwnProperty(i)){
            arr.push(this.members[i].toString());
        }
    }
    return arr.join(" and ");
};
test.addMember("a", "a value");
test.addMember("b", "b value");
alert(test.toString());

另一种方式（成员是一个数组）：

var test = { members : [] };
test.addMember = function(name, value) { 
    var arr= { name : name, value : value }; 
    arr.toString = function() { 
        return this.name + " has a " + this.value; 
    };
    this.members.push(arr);
};
test.toString = function() { 
    return this.members.join(" and ");
};
test.addMember("a", "a value");
test.addMember("b", "b value");
alert(test.toString());

JS：join（） - 一个对象数组

2 个答案: