数组去重

var arr = [1,2,3,2,2,2,5,5,4,8,6,9,7]

arr =new Set(arr)

    console.log(arr)

 

 <script type="text/javascript">
        var arr = [1,2,3,2,2,2,5,5,4,8,6,9,7]

         arr =[...new Set(arr)]
        
    console.log(arr)
</script>