Question

我有以下js见this fiddle。

    var name = ["Ted", "Sarah", "Nancy", "Ted", "Sarah", "Nancy"];
    var prodID = [111, 222, 222, 222, 222, 222];
    var prodName = ["milk", "juice", "juice", "juice", "juice", "juice"];
    var qty = [1, 2, 3, 3, 3, 1];
    var data = {};
    for (i = 0; i < name.length; i++) {
        if (!data[name[i]]) {
            purchased = {
                "name": name[i],
                "prodID": prodID[i],
                "prodName": prodName[i],
                "qty": qty[i]
            };
            data[name[i]] = purchased;
        } else {
            purchased = data[name[i]];
            purchased.qty += +qty[i];
        }
        data[name[i]] = purchased;
    }
    data = $.map(data, function (val, key) {
        return val;
    });
    data.sort();
    $.each(data, function (i, val) {
        var plural = "";
        if (val.qty > 1) {
            plural = "'s";
        }
    $('body').append(val.name + ' has purchased ' + val.qty + ' bottle' + plural + ' of ' + val.prodName + '<br>');
    });

哪个输出

特德购买了4瓶牛奶莎拉购买了5瓶果汁南希购买了4瓶果汁

我想要做的是展示他们购买的每种产品以及每种产品的数量。

例如，看上面的Ted已经购买了1瓶牛奶和3瓶果汁，但我现在正在输出Ted已经购买了4瓶牛奶，因为4是他购买的总量。登记/> 如何按每个prodID / ProdName对其进行分组，以便我得到以下内容。

特德购买了1瓶牛奶和3瓶果汁莎拉购买了5瓶果汁南希购买了4瓶果汁

Answer 1

第一步是将数据结构转换为更合适的结构，例如：

name.forEach(function(nam, i) {
    data[nam] = data[nam] || {};
    pid = prodID[i];
    data[nam][pid] = data[nam][pid] || {total:0, pname: prodName[i]};
    data[nam][pid].total += qty[i];
});

给你

 "Ted": {
  "111": {
   "total": 1,
   "pname": "milk"
  },
  "222": {
   "total": 3,
   "pname": "juice"
  }
 },
 "Sarah": {
  "222": {
   "total": 5,
   "pname": "juice"
  }
 },
 "Nancy": {
  "222": {
   "total": 4,
   "pname": "juice"
  }
 }

鉴于此，生成输出非常简单：

message = Object.keys(data).map(function(nam) {
    var purchases = data[nam];
    return nam + ' got ' + Object.keys(purchases).map(function(pid) {
        return purchases[pid].total + ' bottle(s) of ' + purchases[pid].pname
    }).join(' and ');
}).join(' <br> ');

http://jsfiddle.net/yP6X5/1/

（复数留作练习，请注意正确的表单是bottles，而不是bottle's。

使用javascript通过常用值对对象属性进行分组

1 个答案: