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JavaScript arrays can contain objects. javascript array is a collection of data arranged in order, the array can contain any type of data, that is, the type of array elements is not limited, can be a number, string, array, Object and other types.

Operating environment of this tutorial: Windows 7 system, Javascript version 1.8.5, Dell G3 computer.

JavaScript arrays can contain objects.

An array is a collection of sequentially arranged data, each value in the array is called an element, and the array can contain any type of data.

Examples:

let arr = [1,'hello',true,[1,2],{name: 'Bob',age:20}];console.log(arr);

As you can see, when defining arrays and assigning values, the values of array elements can be numbers, strings, booleans, arrays, objects, and so on.

In short, there are no restrictions on the types of array elements.

Extended knowledge: pseudo-class arrays

Pseudo-class arrays, also known as class arrays, are objects with array-like structures. Simply put, the property name of the object is a non-negative integer, and it starts from 0, increases sequentially, and contains the length attribute. It should also ensure that its value is dynamically consistent with the number of ordered subscript attributes, so as to facilitate iterative operations on pseudo-class arrays. The jQuery object is known as a pseudo-class array.

example

In the example below, obj is an object literal that JavaScript no longer treats as an array subscript when assigned to it using an array subscript, but as an attribute name of the object.

var obj = {}; //define object literal obj[0] = 0;obj[1] = 1;obj[2] = 2;obj.length = 3;console.log(obj["2"]); //returns 2

It is equivalent to an object direct quantity.

var obj = { 0 : 0, 1 : 1, 2 : 2, length : 3};

Because numbers are illegal identifiers, you cannot read or write attributes using dot syntax.

console.log(obj.0);

Instead, you should use bracket syntax to read and write attributes.

console.log(obj["2"]); Read here, this article "javascript array can not contain objects" article has been introduced, want to master the knowledge of this article also need to practice to understand, if you want to know more about the content of the article, welcome to pay attention to the industry information channel.

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