4 small ways to manipulate arrays

First, push ()

Adds content to the last array. has a return value: array length

Second, Unshift ()

Adds content to the front of the array. return Value: Array length

Third, pop ()

Moves the last data of the divisor group. return Value: The data information that was removed.

Four, Shift ()

Removes the first bit of data from the divisor group. return Value: The data information that was removed.

Small example:　

var attr=[' 1 ', ' 2 ', ' 3 ', ' 4 ']//put the 4 in the array first, 1 to the last/*attr.pop ()///Remove the last 4 with a return value of 4;attr.unshift (Attr.pop ());/* Attr.shift () *///removes the first digit 1, whose return value is 1;attr.pop (Attr.shift ());

　　

　　

4 small ways to manipulate arrays