更多的浏览器支持和更灵活的方法是使用一个正常的循环，比如:

const arr = ['a', 'b', 'c'],
obj = {};

for (let i=0; i<arr.length; i++) {
   obj[i] = arr[i];
}

但现代的方法也可以使用展开运算符，比如:

{...arr}

或对象赋值:

Object.assign({}, ['a', 'b', 'c']);

两者都会返回:

{0: "a", 1: "b", 2: "c"}

如果有人在搜索Typescript方法，我这样写:

const arrayToObject = <T extends Record<K, any>, K extends keyof any>(
  array: T[] = [],
  getKey: (item: T) => K,
) =>
  array.reduce((obj, cur) => {
    const key = getKey(cur)
    return ({...obj, [key]: cur})
  }, {} as Record<K, T>)

它将:

强制第一个参数为对象数组 帮助选择键 强制该键为所有数组项的键

例子:

// from:
const array = [
    { sid: 123, name: 'aaa', extra: 1 },
    { sid: 456, name: 'bbb' },
    { sid: 789, name: 'ccc' }
];
// to:
{
  '123': { sid: 123, name: 'aaa' },
  '456': { sid: 456, name: 'bbb' },
  '789': { sid: 789, name: 'ccc' }
}

用法:

const obj = arrayToObject(array, item => item.sid) // ok
const obj = arrayToObject(array, item => item.extra) // error

这是一个演示。

更面向对象的方法:

Array.prototype.toObject = function() {
 var Obj={};

 for(var i in this) {
  if(typeof this[i] != "function") {
   //Logic here
   Obj[i]=this[i];
  }
 }

 return Obj;
}

快速和肮脏的#2:

var i = 0
  , s = {}
  , a = ['A', 'B', 'C'];

while( i < a.length ) { s[i] = a[i++] };

我的版本数组json在JS。只需要复制/粘贴并使用它。这是不是很棒?我喜欢我在StackOverflow上发现的这类函数。

function array2json(arr) {
    var parts = [];
    var is_list = (Object.prototype.toString.apply(arr) === '[object Array]');

    for(var key in arr) {
        var value = arr[key];
        if(typeof value == "object") { //Custom handling for arrays
            if(is_list) parts.push(array2json(value)); /* :RECURSION: */
            else parts[key] = array2json(value); /* :RECURSION: */
        } else {
            var str = "";
            if(!is_list) str = '"' + key + '":';

            //Custom handling for multiple data types
            if(typeof value == "number") str += value; //Numbers
            else if(value === false) str += 'false'; //The booleans
            else if(value === true) str += 'true';
            else str += '"' + value + '"'; //All other things
            // :TODO: Is there any more datatype we should be in the lookout for? (Functions?)

            parts.push(str);
        }
    }
    var json = parts.join(",");

    if(is_list) return '[' + json + ']';//Return numerical JSON
    return '{' + json + '}';//Return associative JSON
}

import books from "./books.json";

export const getAllBooks = () => {
  return {
    data: books,
    // a=accoumulator, b=book (data itelf), i=index
    bookMap: books.reduce((a, book, i) => {
      // since we passed {} as initial data, initially a={}
      // {bookID1:book1, bookID2:i}
      a[book.id] = book;
      // you can add new property index
      a[book.id].index=i
      return a;
      // we are passing initial data structure
    }, {}),
  };
};