Javascript：如何向具有键值对的数组中添加新元素？

Question

I have an array say a[0] which already has it's own key value pairs. Now I'd like to another element to the array a which would be a[1] and add a property to it.

I'd like to add key value pairs to that newly added property to a[1] .

Ex : a[1] now has say address . Now I want to add key value pairs such as

"street" : "Avenue St"
"pin" : "560064"

And then I want to add another key-value pair say "city" : "Tokyo"

Finally it must look like :

address : {
   "street" : "Avenue St"
   "pin" : "560064"
}
city : "Tokyo"

And this should be for the same array index : a[1].

How do I do this?

Answer 1

You can do the following way:

 var a = [{name: "John"},{address: "Old Avenue St"}]; a[1].address = {"street" : "Avenue St", "pin" : "560064"}; console.log(a); 

Answer 2

You can use push , using index will may cause unwanted issues, as you need to remember / calculate size of array every-time.

 var a = [{name: "John"}]; a.push({ address: {"street" : "Avenue St", "pin" : "560064"} }); console.log(a);