如何在JavaScript中访问对象的多维数组？

Question

I need to access JavaScript objects stored in a multi-dimensional array. The data is being exported by a WordPress plug-in. Note, I cannot change the code to use a single array.

There are two arrays named "employees". Is this array format compatible with JavaScript? The JSON export was intended for PHP processing.

(Note, The code below is a simplified model to illustrate the issue).

var data = '{"employees":[{"firstName":"John0"},  {"firstName":"Anna0"},{"firstName":"Peter0"}],"employees":[{"firstName":"John1"},  {"firstName":"Anna1"},{"firstName":"Peter1"}]};';

var json = JSON.parse(data);

document.querySelector('#test').innerHTML = json.employees[2].firstName;

Here it is on JSFiddle:

https://jsfiddle.net/2524fhf4/11/

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How for example, would one access the value "Peter0" in the first array? In a single array, it would be accessed like this:

var result = json.employees[2].firstName;

It appears to me that in this format it is only possible to access the last array.

Answer 1

It appears to me that in this format it is only possible to access the last array.

Because when your object literal has two (or more) keys of the same name , last one will override the rest of them .

Check this demo

 var data = '{"employees":[{"firstName":"John0"}, {"firstName":"Anna0"},{"firstName":"Peter0"}],"employees":[{"firstName":"John1"}, {"firstName":"Anna1"},{"firstName":"Peter1"}]}'; console.log(JSON.parse(data)); //it will only display first one 

In the above example, you can see that there is only one key of the data