将数组转换为具有数组值的对象

function arrayToObject(arr) {
  var obj = {};
  for (var i = 0; i < arr.length; i++) {
    obj[i] = arr[i];
  }
  return obj;
}

var arr = ['apple', 'banana', 'orange'];
var obj = arrayToObject(arr);
console.log(obj);

function arrayToObject(arr) {
  return arr.reduce(function(obj, value, index) {
    obj[index] = value;
    return obj;
  }, {});
}

var arr = ['apple', 'banana', 'orange'];
var obj = arrayToObject(arr);
console.log(obj);