In javascript, what are the common methods for arrays ?, Javascript Array

In javascript, what are the common methods for arrays ?, Javascript Array

Answer:

Push

Pop

Shift

Unshift

Join

Sort

Concat

Reverse

Splice

Slice

IndexOf

What is this representation in the javascript array?

The comma operator executes the expressions on both sides of the expression from left to right and obtains the value of the expression on the right.
So a [] is actually a [1], and the first 1 has no effect.
Of course, a [1] [1] and a [1] are completely different.

The most common comma is used in the for loop.
For (I = 0; I <10; I ++, j ++)
{
K = I + j;
}
At the end of each loop, the for statement only allows a single expression to be executed ., The operator is used to allow multiple expressions to be treated as a single expression, thus avoiding this restriction.

What are the arrays in javascript?

I don't understand what you mean.
There is only one array in js. There are three defining methods.
Fruit = new Array (3); // fruit = new Array ();
Fruit [0] = "apple ";
Fruit [1] = "Pears ";
Fruit [2] = "orange ";

Fruit = new Array ("apple", "Pear", "orange ");

Fruit = ["apple", "Pear", "orange"];