Question

我正在尝试找到一种方法，将car.engine.name的值提供给manufacturer对象的属性info。我尝试过很少的东西，但我一直都没有定义。

var car = { engine:{} }
car.engine = {

    name : "bmw",
    info : {
        rpm : 5500,
        manufacturer : car.engine.name // undefined
    }

}

Answer 1

关键是让第一个赋值先执行，以便属性存在，然后从现有数据中设置manufacturer属性。

var car = { engine:{} }
car.engine = {
    name : "bmw",
    info : {
        rpm : 5500
    }
}
car.engine.info.manufacturer = car.engine.name;

Answer 2

或者，框架不可知：

var Car = function (config) {
    this.engine = {
        name: config.name,
        info: {
            rpm: config.rpm,
            manufacturer: config.name
        }
    }
}

var bmw = new Car({name: 'bmw', rpm: 5500});

Answer 3

尝试这样的事情

$(function(){
    var _name = "bmw"
    var car = { engine:{} }
    car.engine = {

        name : _name,
        info : {
            rpm : 5500,
            manufacturer : _name
        }

    }
    console.log(car.engine.name)//bmw
    console.log(car.engine.info.manufacturer)//bmw
})

JavaScript对象文字属性范围

3 个答案: