如何连接(变量+对象键名)以点表示法获取对象值 [英] how to concatenate (variable + object key names) to get the object values in dot notation

问题描述

假设我有一个像这样的JSON对象:

Assuming I've a JSON object like this:

var myObj = {
    'question1': {
        'option1': 'foo',
        'option2': 'bar',
        'option3': 'baz'
    },
    'question2': {
        ...
    },
    'question3': {
        ...
    }
};

并且由于其子项的键中始终有一个数字，因此我想执行一个循环，并连接该循环到对象键的索引，并以点表示法获取值.

And since its children always has a number in its keys, I want to do a loop and concatenate the loop's index to the object keys, and get the values in the dot notation method...

所以，我想获取值，我需要做这样的事情:

So, I guess to get the values, I need to do some thing like this:

myObj.'question'+i

如何正确进行串联?

推荐答案

只需做

myObj['question'+i]

这是因为点运算符不会按照javascript接受字符串.因此，您将不得不使用方括号，而方括号通常用于动态访问对象的属性.

This is because the dot operator would not accept string with it as per javascript. So you will have to use square brackets instead which is often used to access properties of an object dynamically.

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