扩展Array方法

       Array.prototype.where = function (callback) {
            var array = []
            for (var i = 0; i < this.length; i++) {
                if (callback.apply(this[i]) != false) {
                    array.push(this[i])
                }
            }
            return array;
        }

        Array.prototype.each = function (callback) {
            for (var i = 0; i < this.length; i++) {
                if (callback.apply(this[i]) == false) {
                    break;
                }
            }
        }

        var data = [];
        data.push({ min: 0, max: 100, value: 1 });
        data.push({ min: 51, max: 150, value: 2 });
        data.push({ min: 101, max: 200, value: 3 });
        data.push({ min: 151, max: 450, value: 4 });
        var N = 150;

        data.where(function () {
            return (this.min <= N && this.max >= N)
        }).each(function () {
            alert(this.value);
        });