var  arr = []

function quick（arr）{

            if（arr.length<=1）{

            return  arr

}

            let temp = arr[0]

            let left = []

            let right = []

            for(var i=0;i<arr.length;i++){

                       if(arr[i]>temp){

                        right.push(arr[i])

                        }else{

                        left.push(arr[i])

                         }

    }

return quick(left).concat(temp,quick(right))

}