根据键获取javascript对象的值？

Question

我们如何获得动态创建的特定键值，例如

汽车对象是动态的

 var car = {type:"Fiat", model_2017:"500", color:"white"};
 var car = {type:"Fiat", model_2016:"500", color:"white"};
 var car = {type:"Fiat", model_2015:"500", color:"white"};

如何获取第二个字段的值，这是动态的，我正在尝试这样但是它给出了未定义的

var model_year=2015;
model_year= "model_"+model_year
car.model_year

Answer 1

您可以尝试使用[]语法

进行访问

car[model_year]

var car = {type:"Fiat", model_2017:"500", color:"white"};
var car = {type:"Fiat", model_2016:"500", color:"white"};
var car = {type:"Fiat", model_2015:"500", color:"white"};

var model_year=2015;
model_year= "model_"+model_year
console.log(car[model_year])