The principle of the Object.prototype.toString method in JavaScript

In JavaScript, the most reliable way to determine what kind of built-in type an object's value belongs to is through the Object.prototype.toString method.

　　<; ECMAScript 3

1. In ES3, the specification of the Object.prototype.toString method is as follows:

15.2.4.2 Object.prototype.toString ()

When the ToString method is called, the following procedure is performed:

1. Gets the value of the [[Class]] property of this object.

2. Calculated three string "[object", the first step of the operation result (1), and "]" after the connection of the new string.

3. Returns the result of the operation of the second step (2).

　　

The principle of the Object.prototype.toString method in JavaScript