8.其他

8-1reverse

<script>
        var arr=[1,2,3]
        console.log(arr.reverse())
</script>//[3,2,1]

8-2includes查找数组中是否存在某值（返回值为boolean值）

<script>
        var arr=[1,2,3]
        console.log(arr.includes(4))//返回值为boolean值
</script>