js--The property method of an Array object __js

Creating and manipulating arrays
1 of the three methods created by the array:
The Var arr=new array ();//creates an empty array without specifying a length.
var arr=new arry (4);//Create an array with a length of 4
var arr=new arry (1,2,3, "a", "B");//Create an array and initialize it.
The array is actually dynamic and can be extended freely.
2 Custom array constructors and create arrays
You need to first define an array and implement the creation and initialization of the array within the constructor. ‘
This pointer is required.
3 function Myarry (N,INDEX2)
{
for (Var i=0;i<n;i++)
{
This[i]=index2;
}
This.length=n;
}
n is an array length, INDEX2 is the initial parameter.
var arr=new myarry ("Jiahzne");
for (var i =0;i<10;i++)
{
document.write (Arr[i]);
}

4 properties of the Arry object
Length: Returns the array lengths.
Prototype:arry.prototype.methodname=functionname/function;
5 Methods of Arry objects:
Concat (Arry): Links other arrays to the end of the current array.
Join (separator): Links An array element to a string. Separator is a link separator.
Pop (): Deletes the last element of the array.
Push (""): Adds an element to the array.
Reverse (): reverse-order the array emissions.
Shift (): Deletes the first element of an array.
Slice (start,end): Gets part of a vegetarian group.
Sort (): Sorts the array.
Splice (Start,count,datacount): (Replace the starting item, the number of replacements, the array to replace)
Unshift ("", ",..): Inserts new data at the beginning of the array.
ToString (): Returns a string containing all the elements in the array, linked by commas.
62-D arrays need to be defined by themselves, using custom array constructors to create object methods.