JS Syntax section-array

The length of the array is dynamically variable, which prevents any type of element

var a=new Array ()

Copying of array elements: a[0]=123 a[2]=456

Value of array: A[i]

Array properties: Number of a.lenght array elements

Method: A.sort () sorts the array by default by sorting the characters within the array A.reverse flipping the array

A.indexof (value) Find the first occurrence worth index number

A.laseindexof (value) find the last worthy index number

For ... The in declaration uses the For...in declaration to loop through the elements in the output array.

Merging two arrays-concat () uses the Concat () method to merge two arrays. A.concat (A2)

Numeric array-sort () How to use the sort () method to sort the arrays numerically.

function Sortnumber (A, B)

{return A-B}

(A.sort (Sortnumber))

JS Syntax section-array