Array object method reference_basic knowledge

concat method: Returns a new array, which is a combination of two or more arrays. array1.concat([item1[, item2[, . . . [, itemN]]]])

join method: Returns a string value that contains all the elements of the array connected together, the elements are separated by the specified delimiter. arrayObj.join(separator)

pop method: Removes the last element in the array and returns that element. arrayObj.pop()

push method: Adds new elements to an array and returns the new length value of the array. arrayObj.push([item1 [item2 [. . . [itemN ]]]])

reverse method: Returns an Array object with the order of elements reversed. arrayObj.reverse( )

shift method: Remove the first element in the array and return that element. arrayObj.shift( )

slice method: Returns a segment of an array. arrayObj.slice(start, [end])

sort method: Returns an Array object whose elements have been sorted. arrayobj.sort(sortfunction)

splice method: Remove one or more elements from an array, insert a new element at the position of the removed element if necessary, and return the removed element. arrayObj.splice(start, deleteCount, [item1[, item2[, . . . [,itemN]]]])

unshift method: Insert the specified element into the beginning of the array and return the array. arrayObj.unshift([item1[, item2 [, . . . [, itemN]]]])