JavaScript 设计模式 － Iterator(迭代器模式) - 数组示例

javascript-iterator-array.js

/* 迭代器示例 */
var agg = (function() {
  var index = 0,
    data = [1,2,3,4,5,6];
    length = data.length;

  var api = {

    next: function() {
      if(!this.hasNext()) {
        return null;
      }
      return data[index++];
    },

    hasNext: function() {
      return index < length;
    },

    rewind: function() {
      index = 0;
    },

    current: function() {
      return data[index];
    }

  };

  return api;

})();

//测试
while(agg.hasNext()) {
  console.log(agg.next());
}
agg.rewind();
console.log(agg.current());

//输出
//1
//2
//3
//4
//5
//6
//1