JavaScript数组键/值对使用键的文字变量名称 [英] JavaScript Array of Key/Value Pairs Uses Literal Variable Name for Key

问题描述

我正在尝试使用 push 方法创建一个键/值对数组，但会产生意外结果。

I'm trying to create an array of key/value pairs by using the push method, but getting unexpected results.

console.log 打印出来：

books：[{ bookTitle：Mark Twain}]

books: [{"bookTitle":"Mark Twain"}]

我希望如此：

书籍：[{Tom Sawyer：Mark Twain}]

books: [{"Tom Sawyer" : "Mark Twain"}]

这里是代码：

var books = [];
var bookTitle = "Tom Sawyer";
var author = "Mark Twain";

books.push({bookTitle : author})

console.log("books: %s", JSON.stringify(books))

我试过 books.bookTitle = author 和 books [bookTitle] = author ，但结果是一样的。任何帮助表示赞赏。

I've tried books.bookTitle = author and books[bookTitle] = author, but the result is the same. Any help is appreciated.

推荐答案

Bracket notation 是使用动态密钥名称的正确方法：

Bracket notation is the correct way to use a dynamic key name:

books[bookTitle] = author

但是，您需要使用中间对象：

However, you need to use an intermediate object:

var books = [];
var bookTitle = "Tom Sawyer";
var author = "Mark Twain";
var foo = {};
foo[bookTitle] = author;

books.push(foo);

console.log("books: %s", JSON.stringify(books))

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