问题:

I am trying to convert an array to an object, and I'm almost there.

Here is my input array:

[ {id:1,name:"Paul"},   {id:2,name:"Joe"},   {id:3,name:"Adam"} ]

Here is my current output object:

{ '0': {id:1,name:"Paul"},   '1': {id:2,name:"Joe"},   '2': {id:3,name:"Adam"} }

Here is my desired output object:

[ {id:1,name:"Paul"},   {id:2,name:"Joe"},   {id:3,name:"Adam"} ]

Here is my current code:

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1:

You can't do that.

{ {id:1,name:"Paul"},   {id:2,name:"Joe"},   {id:3,name:"Adam"} }

Is not a valid JavaScript object.

Objects in javascript are key-value pairs. See how you have id and then a colon and then a number? The key is id and the number is the value.

You would have no way to access the properties if you did this.

Here is the result from the Firefox console:

{ {id:1,name:"Paul"},   {id:2,name:"Joe"},   {id:3,name:"Adam"} }  SyntaxError: missing ; before statement

回答2:

Since the objects require a key/value pair, you could create an object with the ID as the key and name as the value:

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:

{     '1': 'Paul',     '2': 'Jod',     '3': 'Adam' }

转载请标明出处:JavaScript: Converting Array to Object

文章来源: JavaScript: Converting Array to Object

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