如何在javascript中实现Master详细信息类查找功能？

Question

我有这段代码：

    function Item(id, itemType, itemData, itemCategoryId, itemRank) {
    this.id = id;
    this.itemType = itemType;
    this.itemData = itemData;
    this.itemCategoryId = itemCategoryId;
    this.itemRank = itemRank;
}
function Category(id) {
    this.id = id;
}

我想为Item类编写一个函数，我给它ClassId，它将返回具有此Category id的所有item对象，
什么是最好的方法呢？

Answer 1

我看不到阵列......

我认为会有一个项目原型（ 请注意，javascript 中没有类），它看起来像这样：

function Item(id, categoryId, data, rank) {
  this.id = id;
  this.categoryId = categoryId;
  this.data = data;
  this.rank = rank;
}

function Items() {
  this.items = [];
  this.findByCategory = function(categoryId) { 
    var result = [];
    for(var i=0;i<this.items.length;i++) {
       if (categoryId == this.items[i].categoryId) 
          result.push(this.items[i]);
    }
    return result;
  }
  this.add = function(id, categoryId, data, rank) {
    this.items.push(new Item(id, categoryId, data, rank));  
  }
}

var items = new Items();
items.add(2, 0, null, null); 
items.add(1, 1, null, null); // I'm not going to care about data and rank here
items.add(2, 1, null, null); 
items.add(3, 1, null, null); 
items.add(4, 2, null, null); 
items.add(5, 3, null, null); 

var cat1 = items.findByCategory(1);
alert(cat1); // you will get a result of 3 objects all of which have category 1