Javascript 向函数添加自定义属性

搜索合适的答案被证明是困难的，因为我的关键词还存在许多其他问题，所以我在这里要问这个问题

正如我们所知，javascript中的函数是对象，它们有自己的属性和方法（更确切地说，是从function.prototype继承的函数istance）

我正在考虑为一个函数（方法）添加自定义属性，让我们跳过“为什么？”部分，直接转到代码：

var something = {
    myMethod: function () {
        if (something.myMethod.someProperty === undefined) {
            something.myMethod.someProperty = "test";
        }
        console.log(something.myMethod);
    }
}

当使用Firebug的DOM资源管理器进行检查时，该属性按预期定义。但是，由于我不认为自己是JavaScript专家，所以我有以下问题：

该方法是否被视为“合适”且符合标准？它可以在Firefox中工作，但在web浏览器中有许多东西可以正常工作，而且根本不是标准

通过向对象添加新属性来更改对象是一种好的做法吗

---

对你的问题给出一个非常有意义的答案有点困难，因为你说“这是我的解决方案，可以吗？”而没有解释你试图解决的问题（你甚至明确地说你不打算解释“为什么”）。您的代码看起来是可以运行的有效JavaScript，但它看起来也是一种不太理想的方式

如果您解释了您真正想要实现的目标，您可能会得到一些关于更好地构建代码的方法的好建议。不过，我还是会给你一些答案：

该方法是否被视为“合适”且符合标准？它可以在Firefox中工作，但在web浏览器中有许多东西可以正常工作，而且根本不是标准

函数是对象（如您所说），因此可以向其添加属性。这实际上不是一个标准问题，因为它是所有浏览器都支持的JavaScript的核心部分

通过向对象添加新属性来更改对象是一种好的做法吗

它是你的对象，你可以添加任何你喜欢的属性。对象的全部意义在于它们具有可以操纵的特性。我真的无法设想一种使用对象的方式，而不涉及对其进行修改，包括添加、删除和更新属性和方法

话虽如此，对我来说，将属性添加到

myMethod

函数中并没有真正的意义，更常见的做法是将其他属性添加到

something

对象中（如果调用正确，您的

myMethod

函数可以通过

this

关键字访问

something

的其他属性）

如果您将函数用作构造函数，则向关联的原型中添加方法并向每个实例中添加（非方法）属性通常是有意义的，但在适当的情况下，您可以使用其中一种或两种方法（注意，“方法”本质上只是引用函数的属性）

您显示的特定代码不添加属性，它测试

someProperty

属性是否已经存在，如果已经存在，则为其分配一个新值

您可以在MDN上阅读以下文章：

---

我意识到我做这件事已经晚了很多年，但我想添加这个例子——requirejs在define（）函数上设置了一个名为“amd”的属性，这非常方便，因为UMD模式使用它来检测范围内的define（）函数实际上是一个amd define（）函数

RequireJS来源：

---

显示此用法的UMD模式：

首先，重要的是要认识到标准函数属性（参数、名称、调用方和长度）不能被覆盖。因此，忘记添加具有该名称的属性

向函数添加您自己的自定义属性可以采用在每个浏览器中都适用的不同方式

---

将自己的自定义属性添加到函数中 方式1:运行函数时添加属性：

var doSomething = function() {
    doSomething.name = 'Tom';
    doSomething.name2 = 'John';
    return 'Beep';
};

console.log('doSomething.name : ' + doSomething.name);
console.log('doSomething.name2 : ' + doSomething.name2);
console.log('doSomething() : ' + doSomething());
console.log('doSomething.name : ' + doSomething.name);
console.log('doSomething.name2 : ' + doSomething.name2);

function doSomething() {
    return 'Beep';
};
    
doSomething.name = 'Tom';
doSomething.name2 = 'John';

console.log('doSomething.name : ' + doSomething.name);
console.log('doSomething.name2 : ' + doSomething.name2);
console.log('doSomething() : ' + doSomething());
console.log('doSomething.name : ' + doSomething.name);
console.log('doSomething.name2 : ' + doSomething.name2);

var doSomething = (function(args) {
    var f = function() {
        return 'Beep';
    };
    for (i in args) {
        f[i] = args[i];
    }
    return f;
}({
    'name': 'Tom',
    'name2': 'John'
}));

console.log('doSomething.name : ' + doSomething.name);
console.log('doSomething.name2 : ' + doSomething.name2);
console.log('doSomething() : ' + doSomething());
console.log('doSomething.name : ' + doSomething.name);
console.log('doSomething.name2 : ' + doSomething.name2);

var extend = function(obj, args) {
    if (Array.isArray(args) || (args !== null && typeof args === 'object')) {
        for (i in args) {
            obj[i] = args[i];
        }
    }
    return obj;
}
    
var doSomething = extend(
    function() {
        return 'Beep';
    }, {
        'name': 'Tom',
        'name2': 'John'
    }
);

console.log('doSomething.name : ' + doSomething.name);
console.log('doSomething.name2 : ' + doSomething.name2);
console.log('doSomething() : ' + doSomething());
console.log('doSomething.name : ' + doSomething.name);
console.log('doSomething.name2 : ' + doSomething.name2);

var extendableFunction = (function() {
    var extend = function(args) {
        if (Array.isArray(args) || (args !== null && typeof args === 'object')) {
            for (i in args) {
                this[i] = args[i];
            }
        }
        return this;
    };
    var ef = function(v, obj) {
        v.extend = extend;
        return v.extend(obj);
    };

    ef.create = function(v, args) {
        return new this(v, args);
    };
    return ef;
})();

var doSomething = extendableFunction.create(
    function() {
        return 'Beep';
    }, {
        'name': 'Tom',
        'name2': 'John'
    }
);

console.log('doSomething.name : ' + doSomething.name);
console.log('doSomething.name2 : ' + doSomething.name2);
console.log('doSomething() : ' + doSomething());
console.log('doSomething.name : ' + doSomething.name);
console.log('doSomething.name2 : ' + doSomething.name2);

输出：

doSomething.name : 
doSomething.name2 : undefined
doSomething() : Beep
doSomething.name : 
doSomething.name2 : John 

doSomething.name : doSomething
doSomething.name2 : undefined
doSomething() : Beep
doSomething.name : doSomething
doSomething.name2 : John 

doSomething.name : f
doSomething.name2 : undefined
doSomething() : Beep
doSomething.name : f
doSomething.name2 : John 

doSomething.name : doSomething
doSomething.name2 : John
doSomething() : Beep
doSomething.name : doSomething
doSomething.name2 : John 

doSomething.name : 
doSomething.name2 : John
doSomething() : Beep
doSomething.name : 
doSomething.name2 : John 

doSomething.name : 
doSomething.name2 : John
doSomething() : Beep
doSomething.name : 
doSomething.name2 : John 

doSomething.name : 
doSomething.name2 : John
doSomething() : Beep
doSomething.name : 
doSomething.name2 : John 

doSomething.name : 
doSomething.name2 : John
doSomething() : Beep
doSomething.name : 
doSomething.name2 : John 

doSomething.name : 
doSomething.name2 : John
doSomething() : Beep
doSomething.name : 
doSomething.name2 : John 

doSomething.name : f
doSomething.name2 : John
doSomething() : Beep
doSomething.name : f
doSomething.name2 : John 

---

方式1（可选语法）：

输出：

doSomething.name : 
doSomething.name2 : undefined
doSomething() : Beep
doSomething.name : 
doSomething.name2 : John 

doSomething.name : doSomething
doSomething.name2 : undefined
doSomething() : Beep
doSomething.name : doSomething
doSomething.name2 : John 

doSomething.name : f
doSomething.name2 : undefined
doSomething() : Beep
doSomething.name : f
doSomething.name2 : John 

doSomething.name : doSomething
doSomething.name2 : John
doSomething() : Beep
doSomething.name : doSomething
doSomething.name2 : John 

doSomething.name : 
doSomething.name2 : John
doSomething() : Beep
doSomething.name : 
doSomething.name2 : John 

doSomething.name : 
doSomething.name2 : John
doSomething() : Beep
doSomething.name : 
doSomething.name2 : John 

doSomething.name : 
doSomething.name2 : John
doSomething() : Beep
doSomething.name : 
doSomething.name2 : John 

doSomething.name : 
doSomething.name2 : John
doSomething() : Beep
doSomething.name : 
doSomething.name2 : John 

doSomething.name : 
doSomething.name2 : John
doSomething() : Beep
doSomething.name : 
doSomething.name2 : John 

doSomething.name : f
doSomething.name2 : John
doSomething() : Beep
doSomething.name : f
doSomething.name2 : John 

---

方式1（第二种替代语法）：

输出：

doSomething.name : 
doSomething.name2 : undefined
doSomething() : Beep
doSomething.name : 
doSomething.name2 : John 

doSomething.name : doSomething
doSomething.name2 : undefined
doSomething() : Beep
doSomething.name : doSomething
doSomething.name2 : John 

doSomething.name : f
doSomething.name2 : undefined
doSomething() : Beep
doSomething.name : f
doSomething.name2 : John 

doSomething.name : doSomething
doSomething.name2 : John
doSomething() : Beep
doSomething.name : doSomething
doSomething.name2 : John 

doSomething.name : 
doSomething.name2 : John
doSomething() : Beep
doSomething.name : 
doSomething.name2 : John 

doSomething.name : 
doSomething.name2 : John
doSomething() : Beep
doSomething.name : 
doSomething.name2 : John 

doSomething.name : 
doSomething.name2 : John
doSomething() : Beep
doSomething.name : 
doSomething.name2 : John 

doSomething.name : 
doSomething.name2 : John
doSomething() : Beep
doSomething.name : 
doSomething.name2 : John 

doSomething.name : 
doSomething.name2 : John
doSomething() : Beep
doSomething.name : 
doSomething.name2 : John 

doSomething.name : f
doSomething.name2 : John
doSomething() : Beep
doSomething.name : f
doSomething.name2 : John 

这个策略的一个问题是，你至少需要运行一次函数来分配属性。对于很多函数来说，这显然不是你想要的。所以让我们考虑其他选项。

---

方式2:定义函数后添加属性：

var doSomething = function() {
    doSomething.name = 'Tom';
    doSomething.name2 = 'John';
    return 'Beep';
};

console.log('doSomething.name : ' + doSomething.name);
console.log('doSomething.name2 : ' + doSomething.name2);
console.log('doSomething() : ' + doSomething());
console.log('doSomething.name : ' + doSomething.name);
console.log('doSomething.name2 : ' + doSomething.name2);

function doSomething() {
    return 'Beep';
};
    
doSomething.name = 'Tom';
doSomething.name2 = 'John';

console.log('doSomething.name : ' + doSomething.name);
console.log('doSomething.name2 : ' + doSomething.name2);
console.log('doSomething() : ' + doSomething());
console.log('doSomething.name : ' + doSomething.name);
console.log('doSomething.name2 : ' + doSomething.name2);

var doSomething = (function(args) {
    var f = function() {
        return 'Beep';
    };
    for (i in args) {
        f[i] = args[i];
    }
    return f;
}({
    'name': 'Tom',
    'name2': 'John'
}));

console.log('doSomething.name : ' + doSomething.name);
console.log('doSomething.name2 : ' + doSomething.name2);
console.log('doSomething() : ' + doSomething());
console.log('doSomething.name : ' + doSomething.name);
console.log('doSomething.name2 : ' + doSomething.name2);

var extend = function(obj, args) {
    if (Array.isArray(args) || (args !== null && typeof args === 'object')) {
        for (i in args) {
            obj[i] = args[i];
        }
    }
    return obj;
}
    
var doSomething = extend(
    function() {
        return 'Beep';
    }, {
        'name': 'Tom',
        'name2': 'John'
    }
);

console.log('doSomething.name : ' + doSomething.name);
console.log('doSomething.name2 : ' + doSomething.name2);
console.log('doSomething() : ' + doSomething());
console.log('doSomething.name : ' + doSomething.name);
console.log('doSomething.name2 : ' + doSomething.name2);

var extendableFunction = (function() {
    var extend = function(args) {
        if (Array.isArray(args) || (args !== null && typeof args === 'object')) {
            for (i in args) {
                this[i] = args[i];
            }
        }
        return this;
    };
    var ef = function(v, obj) {
        v.extend = extend;
        return v.extend(obj);
    };

    ef.create = function(v, args) {
        return new this(v, args);
    };
    return ef;
})();

var doSomething = extendableFunction.create(
    function() {
        return 'Beep';
    }, {
        'name': 'Tom',
        'name2': 'John'
    }
);

console.log('doSomething.name : ' + doSomething.name);
console.log('doSomething.name2 : ' + doSomething.name2);
console.log('doSomething() : ' + doSomething());
console.log('doSomething.name : ' + doSomething.name);
console.log('doSomething.name2 : ' + doSomething.name2);

输出：

doSomething.name : 
doSomething.name2 : undefined
doSomething() : Beep
doSomething.name : 
doSomething.name2 : John 

doSomething.name : doSomething
doSomething.name2 : undefined
doSomething() : Beep
doSomething.name : doSomething
doSomething.name2 : John 

doSomething.name : f
doSomething.name2 : undefined
doSomething() : Beep
doSomething.name : f
doSomething.name2 : John 

doSomething.name : doSomething
doSomething.name2 : John
doSomething() : Beep
doSomething.name : doSomething
doSomething.name2 : John 

doSomething.name : 
doSomething.name2 : John
doSomething() : Beep
doSomething.name : 
doSomething.name2 : John 

doSomething.name : 
doSomething.name2 : John
doSomething() : Beep
doSomething.name : 
doSomething.name2 : John 

doSomething.name : 
doSomething.name2 : John
doSomething() : Beep
doSomething.name : 
doSomething.name2 : John 

doSomething.name : 
doSomething.name2 : John
doSomething() : Beep
doSomething.name : 
doSomething.name2 : John 

doSomething.name : 
doSomething.name2 : John
doSomething() : Beep
doSomething.name : 
doSomething.name2 : John 

doSomething.name : f
doSomething.name2 : John
doSomething() : Beep
doSomething.name : f
doSomething.name2 : John 

现在，在您能够访问属性之前，不需要先运行函数。然而，一个缺点是您的属性感觉与函数断开连接

---

方式3:将您的函数包装为匿名函数：

var doSomething = function() {
    doSomething.name = 'Tom';
    doSomething.name2 = 'John';
    return 'Beep';
};

console.log('doSomething.name : ' + doSomething.name);
console.log('doSomething.name2 : ' + doSomething.name2);
console.log('doSomething() : ' + doSomething());
console.log('doSomething.name : ' + doSomething.name);
console.log('doSomething.name2 : ' + doSomething.name2);

function doSomething() {
    return 'Beep';
};
    
doSomething.name = 'Tom';
doSomething.name2 = 'John';

console.log('doSomething.name : ' + doSomething.name);
console.log('doSomething.name2 : ' + doSomething.name2);
console.log('doSomething() : ' + doSomething());
console.log('doSomething.name : ' + doSomething.name);
console.log('doSomething.name2 : ' + doSomething.name2);

var doSomething = (function(args) {
    var f = function() {
        return 'Beep';
    };
    for (i in args) {
        f[i] = args[i];
    }
    return f;
}({
    'name': 'Tom',
    'name2': 'John'
}));

console.log('doSomething.name : ' + doSomething.name);
console.log('doSomething.name2 : ' + doSomething.name2);
console.log('doSomething() : ' + doSomething());
console.log('doSomething.name : ' + doSomething.name);
console.log('doSomething.name2 : ' + doSomething.name2);

var extend = function(obj, args) {
    if (Array.isArray(args) || (args !== null && typeof args === 'object')) {
        for (i in args) {
            obj[i] = args[i];
        }
    }
    return obj;
}
    
var doSomething = extend(
    function() {
        return 'Beep';
    }, {
        'name': 'Tom',
        'name2': 'John'
    }
);

console.log('doSomething.name : ' + doSomething.name);
console.log('doSomething.name2 : ' + doSomething.name2);
console.log('doSomething() : ' + doSomething());
console.log('doSomething.name : ' + doSomething.name);
console.log('doSomething.name2 : ' + doSomething.name2);

var extendableFunction = (function() {
    var extend = function(args) {
        if (Array.isArray(args) || (args !== null && typeof args === 'object')) {
            for (i in args) {
                this[i] = args[i];
            }
        }
        return this;
    };
    var ef = function(v, obj) {
        v.extend = extend;
        return v.extend(obj);
    };

    ef.create = function(v, args) {
        return new this(v, args);
    };
    return ef;
})();

var doSomething = extendableFunction.create(
    function() {
        return 'Beep';
    }, {
        'name': 'Tom',
        'name2': 'John'
    }
);

console.log('doSomething.name : ' + doSomething.name);
console.log('doSomething.name2 : ' + doSomething.name2);
console.log('doSomething() : ' + doSomething());
console.log('doSomething.name : ' + doSomething.name);
console.log('doSomething.name2 : ' + doSomething.name2);

输出：

doSomething.name : 
doSomething.name2 : undefined
doSomething() : Beep
doSomething.name : 
doSomething.name2 : John 

doSomething.name : doSomething
doSomething.name2 : undefined
doSomething() : Beep
doSomething.name : doSomething
doSomething.name2 : John 

doSomething.name : f
doSomething.name2 : undefined
doSomething() : Beep
doSomething.name : f
doSomething.name2 : John 

doSomething.name : doSomething
doSomething.name2 : John
doSomething() : Beep
doSomething.name : doSomething
doSomething.name2 : John 

doSomething.name : 
doSomething.name2 : John
doSomething() : Beep
doSomething.name : 
doSomething.name2 : John 

doSomething.name : 
doSomething.name2 : John
doSomething() : Beep
doSomething.name : 
doSomething.name2 : John 

doSomething.name : 
doSomething.name2 : John
doSomething() : Beep
doSomething.name : 
doSomething.name2 : John 

doSomething.name : 
doSomething.name2 : John
doSomething() : Beep
doSomething.name : 
doSomething.name2 : John 

doSomething.name : 
doSomething.name2 : John
doSomething() : Beep
doSomething.name : 
doSomething.name2 : John 

doSomething.name : f
doSomething.name2 : John
doSomething() : Beep
doSomething.name : f
doSomething.name2 : John 

将函数包装到匿名函数中，您可以将属性收集到对象中，并使用循环在匿名函数中逐个添加这些属性。这样，您的属性感觉与函数的连接更紧密。当需要从现有对象复制属性时，此技术也非常有用。a然而，缺点是，在定义函数时只能同时添加多个属性。而且，如果向函数添加属性是您经常要做的事情，则不会产生干代码

---

方式4:向函数中添加一个“扩展”函数，将对象的属性逐个添加到自身：

var doSomething = function() {
    return 'Beep';
};
    
doSomething.extend = function(args) {
    for (i in args) {
        this[i] = args[i];
    }
    return this;
}

doSomething.extend({
    'name': 'Tom',
    'name2': 'John'
});

console.log('doSomething.name : ' + doSomething.name);
console.log('doSomething.name2 : ' + doSomething.name2);
console.log('doSomething() : ' + doSomething());
console.log('doSomething.name : ' + doSomething.name);
console.log('doSomething.name2 : ' + doSomething.name2);

输出：

doSomething.name : 
doSomething.name2 : undefined
doSomething() : Beep
doSomething.name : 
doSomething.name2 : John 

doSomething.name : doSomething
doSomething.name2 : undefined
doSomething() : Beep
doSomething.name : doSomething
doSomething.name2 : John 

doSomething.name : f
doSomething.name2 : undefined
doSomething() : Beep
doSomething.name : f
doSomething.name2 : John 

doSomething.name : doSomething
doSomething.name2 : John
doSomething() : Beep
doSomething.name : doSomething
doSomething.name2 : John 

doSomething.name : 
doSomething.name2 : John
doSomething() : Beep
doSomething.name : 
doSomething.name2 : John 

doSomething.name : 
doSomething.name2 : John
doSomething() : Beep
doSomething.name : 
doSomething.name2 : John 

doSomething.name : 
doSomething.name2 : John
doSomething() : Beep
doSomething.name : 
doSomething.name2 : John 

doSomething.name : 
doSomething.name2 : John
doSomething() : Beep
doSomething.name : 
doSomething.name2 : John 

doSomething.name : 
doSomething.name2 : John
doSomething() : Beep
doSomething.name : 
doSomething.name2 : John 

doSomething.name : f
doSomething.name2 : John
doSomething() : Beep
doSomething.name : f
doSomething.name2 : John 

通过这种方式，您可以随时扩展多个属性和/或从另一个项目复制属性。不过，如果您经常这样做，那么您的代码也不会枯燥

---

方式5:创建一个通用的“扩展”函数：

var doSomething = function() {
    doSomething.name = 'Tom';
    doSomething.name2 = 'John';
    return 'Beep';
};

console.log('doSomething.name : ' + doSomething.name);
console.log('doSomething.name2 : ' + doSomething.name2);
console.log('doSomething() : ' + doSomething());
console.log('doSomething.name : ' + doSomething.name);
console.log('doSomething.name2 : ' + doSomething.name2);

function doSomething() {
    return 'Beep';
};
    
doSomething.name = 'Tom';
doSomething.name2 = 'John';

console.log('doSomething.name : ' + doSomething.name);
console.log('doSomething.name2 : ' + doSomething.name2);
console.log('doSomething() : ' + doSomething());
console.log('doSomething.name : ' + doSomething.name);
console.log('doSomething.name2 : ' + doSomething.name2);

var doSomething = (function(args) {
    var f = function() {
        return 'Beep';
    };
    for (i in args) {
        f[i] = args[i];
    }
    return f;
}({
    'name': 'Tom',
    'name2': 'John'
}));

console.log('doSomething.name : ' + doSomething.name);
console.log('doSomething.name2 : ' + doSomething.name2);
console.log('doSomething() : ' + doSomething());
console.log('doSomething.name : ' + doSomething.name);
console.log('doSomething.name2 : ' + doSomething.name2);

var extend = function(obj, args) {
    if (Array.isArray(args) || (args !== null && typeof args === 'object')) {
        for (i in args) {
            obj[i] = args[i];
        }
    }
    return obj;
}
    
var doSomething = extend(
    function() {
        return 'Beep';
    }, {
        'name': 'Tom',
        'name2': 'John'
    }
);

console.log('doSomething.name : ' + doSomething.name);
console.log('doSomething.name2 : ' + doSomething.name2);
console.log('doSomething() : ' + doSomething());
console.log('doSomething.name : ' + doSomething.name);
console.log('doSomething.name2 : ' + doSomething.name2);

var extendableFunction = (function() {
    var extend = function(args) {
        if (Array.isArray(args) || (args !== null && typeof args === 'object')) {
            for (i in args) {
                this[i] = args[i];
            }
        }
        return this;
    };
    var ef = function(v, obj) {
        v.extend = extend;
        return v.extend(obj);
    };

    ef.create = function(v, args) {
        return new this(v, args);
    };
    return ef;
})();

var doSomething = extendableFunction.create(
    function() {
        return 'Beep';
    }, {
        'name': 'Tom',
        'name2': 'John'
    }
);

console.log('doSomething.name : ' + doSomething.name);
console.log('doSomething.name2 : ' + doSomething.name2);
console.log('doSomething() : ' + doSomething());
console.log('doSomething.name : ' + doSomething.name);
console.log('doSomething.name2 : ' + doSomething.name2);

输出：

doSomething.name : 
doSomething.name2 : undefined
doSomething() : Beep
doSomething.name : 
doSomething.name2 : John 

doSomething.name : doSomething
doSomething.name2 : undefined
doSomething() : Beep
doSomething.name : doSomething
doSomething.name2 : John 

doSomething.name : f
doSomething.name2 : undefined
doSomething() : Beep
doSomething.name : f
doSomething.name2 : John 

doSomething.name : doSomething
doSomething.name2 : John
doSomething() : Beep
doSomething.name : doSomething
doSomething.name2 : John 

doSomething.name : 
doSomething.name2 : John
doSomething() : Beep
doSomething.name : 
doSomething.name2 : John 

doSomething.name : 
doSomething.name2 : John
doSomething() : Beep
doSomething.name : 
doSomething.name2 : John 

doSomething.name : 
doSomething.name2 : John
doSomething() : Beep
doSomething.name : 
doSomething.name2 : John 

doSomething.name : 
doSomething.name2 : John
doSomething() : Beep
doSomething.name : 
doSomething.name2 : John 

doSomething.name : 
doSomething.name2 : John
doSomething() : Beep
doSomething.name : 
doSomething.name2 : John 

doSomething.name : f
doSomething.name2 : John
doSomething() : Beep
doSomething.name : f
doSomething.name2 : John 

遗传扩展功能允许采用更干练的方法，允许您将对象或任何项目添加到任何其他对象

---

方式6:

---

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