使用闭包 实现区间筛选

  var arr = [1, 2, 3, 4, 5, 6, 7, 8, 9]
        function between(a, b) {
            return function (v) {
                return v > 2 && v < 7
            }
        }
        console.log(arr.filter(between(2, 7)));

方法2

    var arr = [1, 2, 3, 4, 5, 6, 7, 8, 9]
     var a = arr.filter(item => {
             if (item > 2 && item < 7) return item
        })
        console.log(a);