在Javascript对象中打印所有属性 [英] Printing all properties in a Javascript Object

问题描述

我正在关注代码学院教程，我发现这很困难。

I am following a code academy tutorial and i am finding this difficult.

作业如下：

使用for-in循环打印出nyc的所有属性。

Use a for-in loop to print out all the properties of nyc.

var nyc = {
    fullName: "New York City",
    mayor: "Michael Bloomberg",
    population: 8000000,
    boroughs: 5
};

// write your for-in loop here
for (var  in nyc){
    console.log(population);
}

推荐答案

您的语法不正确。 for 循环中的 var 关键字必须后跟变量名称，在本例中为 propName

Your syntax is incorrect. The var keyword in your for loop must be followed by a variable name, in this case its propName

var propValue;
for(var propName in nyc) {
    propValue = nyc[propName]

    console.log(propName,propValue);
}

我建议你看一下基础知识：

I suggest you have a look here for some basics:

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...in

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