js 根据日期将json重新分组

[Jameszhanc]

这是我代码，不知道哪里错了，总是会重复打印

思路：data数组第0项直接push（birthday+detailList）整个，但从第1项就要开始去newArr比较birthday，如果birthday相同，就只用push（detailList），如果不同就push { birthday+detailList }

var data = [
			{"name": "小明","age": "4","birthday": "5-1"},
			{"name": "小黄","age": "4","birthday": "5-1"},
			{"name": "小红","age": "4","birthday": "5-3"},
		]
		
		//[希望得到]
		// var newArr = [
		// 	{
		// 		"birthday":"5-1",
		// 		"detailList":"[ {'name':'小明','age':'4'} , {'name':'小黄','age':'4'}]"
		// 	},
		// 	{
		// 		"birthday":"5-3",
		// 		"detailList":"[ {'name':'小红','age':'4'}]"
		// 	}
		// ]; 
		
		
		var arr = []; //存放新数组
		for (var i = 0; i < data.length; i++) {
			//读取每条数据的日期
			var resBirthday = data[i].birthday;
			
			//当日期相同,只要传这个
			var valDetailList = {
				"name": data[i].name,
				"age": data[i].age
			}
			
			//当日期没有相同的,就新建一个Item
			var valItem = { 
				"birthday": '',
				"detailList": []
			}
			valItem.birthday = resBirthday;
			valItem.detailList.push(valDetailList);
			
			//第0个不需要比较
			if (i == 0) {
				arr.push(valItem);
			} 
			//第1个就要开始找新数组arr相同的日期
			else{
				for (var k = 0; k < arr.length; k++) {
					if (resBirthday == arr[k].birthday) {
						arr[k].detailList.push(valDetailList);
					} 
					else{
						arr.push(valItem);
					}
				}
			}
		}
		console.log(arr);

[天际的海浪]

var data = [
			{"name": "小明","age": "4","birthday": "5-1"},
			{"name": "小黄","age": "4","birthday": "5-1"},
			{"name": "小红","age": "4","birthday": "5-3"},
		]

		//[希望得到]
		// var newArr = [
		// 	{
		// 		"birthday":"5-1",
		// 		"detailList":"[ {'name':'小明','age':'4'} , {'name':'小黄','age':'4'}]"
		// 	},
		// 	{
		// 		"birthday":"5-3",
		// 		"detailList":"[ {'name':'小红','age':'4'}]"
		// 	}
		// ];


		var arr = []; //存放新数组
		for (var i = 0; i < data.length; i++) {
			//读取每条数据的日期
			var resBirthday = data[i].birthday;

			//当日期相同,只要传这个
			var valDetailList = {
				"name": data[i].name,
				"age": data[i].age
			}

			//当日期没有相同的,就新建一个Item
			var valItem = {
				"birthday": '',
				"detailList": []
			}
			valItem.birthday = resBirthday;
			valItem.detailList.push(valDetailList);
			var f = false;
			for (var k = 0; k < arr.length; k++) {
				if (resBirthday == arr[k].birthday) {
					arr[k].detailList.push(valDetailList);
					f = true;
					break;
				}
			}
			if(!f){
				arr.push(valItem);
			}
		}
		console.log(arr);

[Jameszhanc]

谢谢！！！！我想了很久都没想到！！！

[Jameszhanc]

引用 1 楼 天际的海浪 的回复:

var data = [
			{"name": "小明","age": "4","birthday": "5-1"},
			{"name": "小黄","age": "4","birthday": "5-1"},
			{"name": "小红","age": "4","birthday": "5-3"},
		]

		//[希望得到]
		// var newArr = [
		// 	{
		// 		"birthday":"5-1",
		// 		"detailList":"[ {'name':'小明','age':'4'} , {'name':'小黄','age':'4'}]"
		// 	},
		// 	{
		// 		"birthday":"5-3",
		// 		"detailList":"[ {'name':'小红','age':'4'}]"
		// 	}
		// ];


		var arr = []; //存放新数组
		for (var i = 0; i < data.length; i++) {
			//读取每条数据的日期
			var resBirthday = data[i].birthday;

			//当日期相同,只要传这个
			var valDetailList = {
				"name": data[i].name,
				"age": data[i].age
			}

			//当日期没有相同的,就新建一个Item
			var valItem = {
				"birthday": '',
				"detailList": []
			}
			valItem.birthday = resBirthday;
			valItem.detailList.push(valDetailList);
			var f = false;
			for (var k = 0; k < arr.length; k++) {
				if (resBirthday == arr[k].birthday) {
					arr[k].detailList.push(valDetailList);
					f = true;
					break;
				}
			}
			if(!f){
				arr.push(valItem);
			}
		}
		console.log(arr);

谢谢！！我想了很久都没想到！！！