{"msg":"success","result":[{"airCondition":"良","city":"南京","coldIndex":"低发期","date":"2017-04-20","distrct":"南京","dressingIndex":"单衣类","exerciseIndex":"比较适宜","future":[{"date":"2017-04-20","dayTime":"阴","night":"多云","temperature":"22°C / 14°C","week":"今天","wind":"北风 4～5级"},{"date":"2017-04-21","dayTime":"多云","night":"多云","temperature":"22°C / 10°C","week":"星期五","wind":"西风 4～5级"},{"date":"2017-04-22","dayTime":"晴","night":"多云","temperature":"21°C / 10°C","week":"星期六","wind":"北风 小于3级"},{"date":"2017-04-23","dayTime":"多云","night":"多云","temperature":"23°C / 13°C","week":"星期日","wind":"南风 小于3级"},{"date":"2017-04-24","dayTime":"多云","night":"阴","temperature":"26°C / 17°C","week":"星期一","wind":"东南风 小于3级"},{"date":"2017-04-25","dayTime":"阴","night":"阴","temperature":"20°C / 16°C","week":"星期二","wind":"北风 3～4级"},{"date":"2017-04-26","dayTime":"局部多云","night":"局部多云","temperature":"22°C / 12°C","week":"星期三","wind":"东北偏北风 3级"},{"date":"2017-04-27","dayTime":"局部多云","night":"少云","temperature":"23°C / 13°C","week":"星期四","wind":"东南偏东风 2级"},{"date":"2017-04-28","dayTime":"少云","night":"局部多云","temperature":"24°C / 14°C","week":"星期五","wind":"西风 3级"},{"date":"2017-04-29","dayTime":"少云","night":"晴","temperature":"27°C / 16°C","week":"星期六","wind":"西南偏西风 4级"}],"humidity":"湿度:84%","pollutionIndex":"57","province":"苏","sunrise":"05:31","sunset":"18:37",

"temperature":"18℃","time":"07:40","updateTime":"20170420075356","washIndex":"比较适宜","weather":"多云","week":"周四","wind":"西北风3级"}],"retCode":"200"}

---

这样直接看这一大串的数据，是很疼的一件事，我们使用json在线阅读器来整理下结构：

这样看起来好很多了，我们再将数据依次展开：

我们发现在result数组下还嵌套了多个数组，这就是今天说的多级json数据。

我们回头看一眼第一张还没展开的图，有三个数据项：msg，result[]，和retcode，那么这三个怎么读取呢？我们过下流程：

1.在unity的文件目录中新建Plugins文件夹然后将网上下载的litjson.dll拖放到该目录中。

2.新建monobehavior脚本，例如：weatherTest.cs

3.使用using litjson，引入litjson。

4.定义一个string 类型的变量用来承接url，即json文件的地址。

5.编写协程函数并调用。

6.读取json

完整代码如下：

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using LitJson;

public class weatherTest : MonoBehaviour {

void Start () {
StartCoroutine (GetJsonFile());
}

IEnumerator GetJsonFile()
{

if (Util.m_url.Length > 0)
{
WWW www = new WWW(Util.m_url);
if (www != null) {
yield return www;
}
JsonData jd = LitJson.JsonMapper.ToObject (www.text);
//读取第一级
string result = (string)jd["msg"];
JsonData jdItems = jd ["result"];
//读取第二级
string city2 = (string)jdItems [0] ["city"];
//读取第三级
string temp = (string)jd["result"][0]["future"][0]["temperature"];
Debug.Log ( city2 + " " + temp);

}
}