JavaScript USES Object.prototype.toString to determine if it is an array

Why use Object.prototype.toString instead of Function.prototype.toString or something? This is related to their toString interpretation. The following is the explanation of Object.prototype.toString in ECMA:

Object.prototype.toString( )
When the toString method is called, the following steps are taken:

1. Get the [[Class]] property of this object.

2. Compute a string value by concatenating the three strings  " [object  " , Result (1), and  " ] " .

3. Return Result (2)

The process is simple to say: 1, get the object's class name (object type). 2. Then combine [object, obtained class name,] and return.
Array is explained in ECMA as follows:

The [[Class]] property of the newly constructed object is set to  " Array " .

Therefore, we use the following code to detect the array:

function isArray(o) {   return Object.prototype.toString.call(o) === '[object Array]';  }  

This method not only solves the cross-page problem of instanceof, but also solves the problem of the property detection method. It is really a smart way and a good solution.
In addition, this solution can also be applied to the determination of Date,Function, and other types of objects.

There are several other ways:

var arr = []; return arr instanceof Array;  

Post if there are other good ways.