几种json处理方法

 1 var arr = [{
 2       key: '01',
 3       value: '乐乐'
 4    }, {
 5       key: '02',
 6       value: '博博'
 7    }, {
 8       key: '03',
 9       value: '淘淘'
10    },{
11       key: '04',
12       value: '哈哈'
13    },{
14       key: '01',
15       value: '乐乐'
16    }];
17 
18 
19    //  方法1:利用对象访问属性的方法,判断对象中是否存在key
20    var result = [];
21    var obj = {};
22    for(var i =0; i<arr.length; i++){
23       if(!obj[arr[i].key]){
24          result.push(arr[i]);
25          obj[arr[i].key] = true;
26       }
27    }
28    console.log(result); // [{key: "01", value: "乐乐"},{key: "02", value: "博博"},{key: "03", value: "淘淘"},{key: "04", value: "哈哈"}]
29 
30 
31 
32    //  方法2:利用reduce方法遍历数组,reduce第一个参数是遍历需要执行的函数,第二个参数是item的初始值
33       var obj = {};
34     arr = arr.reduce(function(item, next) {
35       obj[next.key] ? '' : obj[next.key] = true && item.push(next);
36       return item;
37    }, []);
38    console.log(arr); // [{key: "01", value: "乐乐"},{key: "02", value: "博博"},{key: "03", value: "淘淘"},{key: "04", value: "哈哈"}]
 1     var array = [{
 2       code: "001",
 3       NO: "1111",
 4       qty: "100"
 5     },{
 6       code: "002",
 7       NO: "1111",
 8       qty: "110"
 9     },{
10       code: "003",
11       NO: "1111",
12       qty: "120"
13     },{
14       code: "001",
15       NO: "2222",
16       qty: "200"
17     },{
18       code: "002",
19       NO: "2222",
20       qty: "210"
21     },{
22       code: "003",
23       NO: "2222",
24       qty: "220"
25     },{
26       code: "001",
27       NO: "3333",
28       qty: "300"
29     },{
30       code: "002",
31       NO: "3333",
32       qty: "310"
33     },{
34       code: "003",
35       NO: "3333",
36       qty: "320"
37     }];
38     var slot_Array = [], slot_Object = {};
39     for (let i = 0; i < array.length; i++) {
40         if(!slot_Object[array[i].NO]){
41             slot_Array.push({
42                 code:array[i].code,
43                 NO:array[i].NO,
44                 // qty:array[i].qty,
45                 datas:[array[i]]
46             });
47             slot_Object[array[i].NO] = array[i];
48         }else{
49             for (let j = 0; j < slot_Array.length; j++) {
50                 if(array[i].NO == slot_Array[j].NO){
51                     slot_Array[j].datas.push(array[i]);
52                 }
53             }
54         }
55     }
56     console.log(slot_Array);

结果:

 

原文地址:https://www.cnblogs.com/landen/p/10572219.html