JavaScript：将数组转换为对象
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JavaScript: Converting Array to Object
提问by Paul
I am trying to convert an array to an object, and I'm almost there.
我正在尝试将一个数组转换为一个对象，我快到了。
Here is my input array:
这是我的输入数组：
[ {id:1,name:"Paul"},
{id:2,name:"Joe"},
{id:3,name:"Adam"} ]
Here is my current output object:
这是我当前的输出对象：
{ '0': {id:1,name:"Paul"},
'1': {id:2,name:"Joe"},
'2': {id:3,name:"Adam"} }
Here is my desired output object:
这是我想要的输出对象：
[ {id:1,name:"Paul"},
{id:2,name:"Joe"},
{id:3,name:"Adam"} ]
Here is my current code:
这是我当前的代码：
function toObject(arr) {
var rv = {};
for (var i = 0; i < arr.length; ++i)
if (arr[i] !== undefined) rv[i] = arr[i];
return rv;
}
回答by tkone
You can't do that.
你不能那样做。
{ {id:1,name:"Paul"},
{id:2,name:"Joe"},
{id:3,name:"Adam"} }
Is not a valid JavaScript object.
不是有效的 JavaScript 对象。
Objects in javascript are key-value pairs. See how you have idand then a colon and then a number? The keyis idand the number is the value.
JavaScript 中的对象是键值对。看看你怎么有id一个冒号，然后是一个数字？的key是id，号码是的value。
You would have no way to access the properties if you did this.
如果这样做，您将无法访问这些属性。
Here is the result from the Firefox console:
这是 Firefox 控制台的结果：
{ {id:1,name:"Paul"},
{id:2,name:"Joe"},
{id:3,name:"Adam"} }
SyntaxError: missing ; before statement
回答by matth
Since the objects require a key/value pair, you could create an object with the ID as the key and name as the value:
由于对象需要键/值对，您可以创建一个以 ID 为键、名称为值的对象：
function toObject(arr) {
var rv = {};
for (var i = 0; i < arr.length; ++i)
if (arr[i] !== undefined) rv[arr[i].id] = arr[i].name;
return rv;
}
Output:
输出：
{
'1': 'Paul',
'2': 'Jod',
'3': 'Adam'
}
