用总和对JavaScript数组分组 [英] Grouping JavaScript array with sum

问题描述

[ 

{t_id :"1",  val1 : "1" ,   title:"cash to purchase",   unit :"bag"},

{t_id :"1"  ,val1 : "1" ,  title:"cash to purchase", unit :"bag"}

{t_id :"1",val1 : "1" , title:"cash to purchase", unit :"bag"}

{t_id :"2",val1 : "4" , title:"offload", unit :"bag"},

{t_id :"2",val1 : "5" , title:"onroad", unit :"bag"},

{t_id :"3", val1 : "5" , title:"Onroad", unit :"bag"},

{t_id :"3", val1 : "6" , title:"Onroad", unit :"bag"},

]

我想按t_id分组根据每个t_id找到val1的总和，然后将val1除以t_id的总数....例如：数组中有三个t-id 1，并且三个t_id的总和为3（val1）..因此val1必须是3 /总t_id（即3/3）...

I want to group by t_id and find the sum of val1 according to each t_id and divide the val1 by total number of t_id .... eg: there are three t-id 1 in the array and sum is of three t_id is 3(val1)..so the val1 must be 3/total t_id( ie 3/3)...

然后我要在HTML上显示

then i want out on my HTML like

标题：购买现金

包：1（即（3/3）

标题：卸载

bag：4.5（即9/2）

bag:4.5 (ie 9/2)

title：onroad

title:onroad

bag：5.5（ie 11/2）...总共是t_id

bag:5.5 (ie 11/2) ...were 2 is total t_id

推荐答案

这样做：

var array = [{t_id:"1",val1:"1",title:"cash to purchase",unit:"bag"},{t_id:"1",val1:"1",title:"cash to purchase",unit:"bag"},{t_id:"1",val1:"1",title:"cash to purchase",unit:"bag"},{t_id:"2",val1:"4",title:"offload",unit:"bag"},{t_id:"2",val1:"5",title:"onroad",unit:"bag"},{t_id:"3",val1:"5",title:"Onroad",unit:"bag"},{t_id:"3",val1:"6",title:"Onroad",unit:"bag"}];


var grouped = [];

array.forEach(function(o) {
  var count = 0;
  if (!this[o.t_id]) {
    this[o.t_id] = {
      t_id: o.t_id,
      val1: 0,
      title: o.title,
      counter: count
    };
    grouped.push(this[o.t_id]);
  }
  this[o.t_id].val1 += Number(o.val1);
  this[o.t_id].counter += Number(++count);
}, Object.create(null));

console.log(grouped);

现在HTML显示如下：包：{{result.val1 / result.counter}}

Now in HTML show like this : Bag: {{result.val1/result.counter}}

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