JS获取数组的最后一项

1、pop()

从数组中删除最后一个元素，并返回元素的值

const arr = ["a","b","c","d"]

const lastelement = arr.pop()

console.log(lastelement)

2、使用length

基于数组的length属性来获取数组的最后一元素

const arr2 = ["a","b","c"] 

const le = arr2[arr2.length-1]