JavaScript learning note--4. Arrays

1. The role of arrays

Bulk processing of data

2. Declaring an array

var arr=[element 1, Element 2, Element 3 ...]//Express Declaration

ARR[1]//Invoke element

var arr=new array (element 1, Element 2, element 3);//declaration using Array Object mode

3. Iterating through an array

For loop

4. Array processing functions

. length//array Length (properties)

. Sort ()//Sort (can have callback function)

. push ()//Add elements (into the stack) after the array

. Pop ()//The element after the divisor group (out of stack \ stack is LIFO)

. Unshift ()//Add elements in front of the array (into the queue)

. Shift ()//Remove the elements in front of the divisor group (out of queue \ queue for FIFO)

. Join ()//concatenate the array into a string using the passed-in connector

. Splice ()//Remove an element

. toString ()//The string representation of the returned object (available for all object types)

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JavaScript learning note--4. Arrays