Add object to js array

Generally, businesses will have the need to add object attributes to arrays.

Here are several common methods of adding objects for your reference:

1. The most common method: push (add at the end)

Business scene

arr =[{'num':1},{'num':2},{'num':3}];

newArr = arr.push({'num':4})

console.log(arr)

result:

2. unshift (header addition)

arr =[{'num':3},{'num':4},{'num':5}];

newArr = arr.unshift({'num':2})

console.log(arr)

result:

 3. Use the splice method to insert, such as inserting an object at index 1

arr =[{'num':1},{'num':3},{'num':4}];

arr.splice(1, 0, {'id': 2})

console.log(arr)

result