codecademy上面的题目，对象的属性名用字符串赋值，如何用所赋值来表示这个属性名？

[liwenxianshifu]

关于JS的问题，在codecademy网站上遇到的，望各位帮忙解决。下面来介绍我遇到的问题：
Sometimes, beginners forget that object literal notation and dot notation assume that the value provided is a string. Take a look at the error here, and try to fix it by using bracket notation.
需求：The programmer wants to use the key 'weight' for the person's weight and store the person's weight in the weight variable.
提示：You can't use object literal notation to initialize the weight. Try using bracket notation for the weight.

person[WEIGHT_KEY] is the same as person['weight'].

You'll need to make two changes to the code.
程序代码：
// We're trying to use WEIGHT_KEY to avoid having to
// remember that the key that stores the weight information
// is called 'weight'.
var WEIGHT_KEY ='weight';

var person = {
name: 'Ryan',
WEIGHT_KEY:350
};

//var weight = person['weight'];

[liwenxianshifu]

早上试着再做一次，居然让我成功了。下面是修改后的程序代码：
// We're trying to use WEIGHT_KEY to avoid having to
// remember that the key that stores the weight information
// is called 'weight'.
var WEIGHT_KEY ='weight';

var person = {
name: 'Ryan',
weight:350
};

var weight = person['weight'];


将person对象属性WEIGHT_KEY改成weight，我想之前我一直做不出来很大部分原因是没有理解英文需求的意思，英文水平不高是一个很大的问题啊！
不过，问题解决了，我真的很开心！哇哈哈哈！