Add a Key Value Pair to an array of objects in javascript?

问题

If I had an array as such:

var myarray = [];

myarray.push({
    "Name": 'Adam',
    "Age": 33
});

myarray.push({
    "Name": 'Emily',
    "Age": 32
});

This gives me an array where I can pull out values like myarray[0].Name which would give me "Adam".

However, after this array is built, how can I add an "address" field with a value of "somewhere street" into the array at position [0], so that my fields in that object at position zero are now Name, Age, and Address with corresponding values?

I was thinking splice() somehow but couldn't find an example using objects, just examples with simple arrays.

回答1:

You can simply add properties ("fields") on the fly.

Try

myarray[0].Address = "123 Some St.";

or

myarray[0]["Address"] = "123 Some St.";

var myarray = [];

myarray.push({
    "Name": 'Adam',
    "Age": 33
});

myarray.push({
    "Name": 'Emily',
    "Age": 32
});

myarray[0]["Address"] = "123 Some St.";

console.log( JSON.stringify( myarray, null, 2 ) );

回答2:

along with a single value like

myarray[0].address = "your address";

Even you can add nested property on the fly as below:

myarray[0].address = { presentAddress: "my present address..." };

and can get the value as: myarray[0].address.presentAddress;

thanks

来源：https://stackoverflow.com/questions/23768280/add-a-key-value-pair-to-an-array-of-objects-in-javascript