我正在尝试创建一个对象,该对象动态地构建自己的getter和setter方法:

function Person( properties ) { // 'properties' is an object literal

    this._private = properties; // private by convention

    for ( key in this._private ) {

        this[key] = function() {

            return this._private[key];
        }
    }
}

我希望这会创建如下内容:
var jack = new Person({

    working:true,
    age:33,
    gender:'male'
});

jack.working() --> true
jack.age() --> 33
jack.gender() --> 'male'

问题是,它总是返回'male',如下所示:
jack.working() --> 'male'
jack.age() --> 'male'
jack.gender() --> 'male'

我想念什么? 哦,这只是一个概念证明。我知道这不是在JavaScript中创建getter和setter的完美解决方案。

最佳答案

您遇到了一个经典的范围界定问题。创建一个新函数以围绕key创建范围:

function Person(properties) { // 'properties' is an object literal
    var key;

    this._private = properties; // private by convention
    this.buildGetter = function (key) {
        this[key] = function () {
            return this._private[key];
        }
    };
    for (key in this._private) {
        this.buildGetter(key);
    }
}

示例: http://jsfiddle.net/SEujb/

关于javascript - 动态Getter和Setters-为什么不起作用?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/13592527/

10-10 09:47