如何使用另一个对象的属性值访问JavaScript对象的属性

Question

Say I have these JavaScript objects:

questions = { name: "Age", options:[boy, girl, daddy]}
answers = {"Age" : 21, "boy" : "checked", daddy : "checked"}

So if I wanted to access the "Age" from the answers object, I would do:

x = answers.Age   //21

But how can I do the same thing but instead using the values from the questions object?

x = answers.questions.name   //problem

or

answers.questions.options[0]  //problem

As you can see I am trying to use the value of questions.name ( "Age" ) to access a property of answers ( Age ).

What's the right syntax or way?

Answer 1

Try this:

var x = answers[questions.name]

This works because:

answers.Age

is equivalent to:

answers['Age']

Answer 2

使用间接引用

answers[questions.name]