1.从openweather获取开源天气信息的方法：

http://api.openweathermap.org/data/2.5/weather?q=London&appid=2233c2ce7363b83f8bc8c182f74316bc

获得的数据如下：

{
　　"coord":{"lon":-0.13,"lat":51.51},
　　"weather":[
　　　　　　　　　　{
　　　　　　　　　　　　"id":500,
　　　　　　　　　　　　"main":"Rain",
　　　　　　　　　　　　"description":"light rain",
　　　　　　　　　　　　"icon":"10n"
　　　　　　　　　　}
　　　　　　　　],
　　"base":"stations",
　　"main":{
　　　　　　　　"temp":284.705,
　　　　　　　　"pressure":1017.11,
　　　　　　　　"humidity":100,
　　　　　　　　"temp_min":284.705,
　　　　　　　　"temp_max":284.705,
　　　　　　　　"sea_level":1024.73,
　　　　　　　　"grnd_level":1017.11
　　　　　　},
　　"wind":{
　　　　　　　　"speed":3.21,
　　　　　　　　"deg":152.502
　　　　　　},
　　"rain":{"3h":1.91},
　　"clouds":{"all":92},
　　"dt":1476597192,
　　"sys":{
　　　　　　　　"message":0.0113,
　　　　　　　　"country":"GB",
　　　　　　　　"sunrise":1476599231,
　　　　　　　　"sunset":1476637427
　　　　　　},
　　"id":2643743,
　　"name":"London",
　　"cod":200
}
2.从openweather获取城市列表的方法：
http://api.openweathermap.org/data/2.5/find?q=London&appid=2233c2ce7363b83f8bc8c182f74316bc

{
　　"message":"accurate","cod":"200","count":4,
　　"list":[
　　　　　　　　{"id":1687801,"name":"Santiago","coord":{"lon":121.548698,"lat":16.68808},"main":{"temp":298.055,"temp_min":298.055,"temp_max":298.055,"pressure":995.55,"sea_level":1014.8,"grnd_level":995.55,"humidity":98},"dt":1476599537,"wind":{"speed":4.26,"deg":142.502},"sys":{"country":"PH"},"rain":{"3h":2.3},"clouds":{"all":88},"weather":[{"id":500,"main":"Rain","description":"light rain","icon":"10d"}]},
　　　　　　　　{"id":3449741,"name":"Santiago","coord":{"lon":-54.867222,"lat":-29.191669},"main":{"temp":295.405,"temp_min":295.405,"temp_max":295.405,"pressure":988.98,"sea_level":1018.33,"grnd_level":988.98,"humidity":92},"dt":1476599513,"wind":{"speed":6.71,"deg":358.502},"sys":{"country":"BR"},"clouds":{"all":44},"weather":[{"id":802,"main":"Clouds","description":"scattered clouds","icon":"03n"}]},
　　　　　　　　{"id":3871336,"name":"Santiago","coord":{"lon":-70.64827,"lat":-33.45694},"main":{"temp":281.83,"temp_min":281.83,"temp_max":281.83,"pressure":944.16,"sea_level":1025.46,"grnd_level":944.16,"humidity":95},"dt":1476599235,"wind":{"speed":1.26,"deg":15.5017},"sys":{"country":"CL"},"rain":{"3h":2.85},"clouds":{"all":88},"weather":[{"id":500,"main":"Rain","description":"light rain","icon":"10n"}]},
　　　　　　　　{"id":3983671,"name":"Santiago","coord":{"lon":-100.150002,"lat":25.41667},"main":{"temp":287.555,"temp_min":287.555,"temp_max":287.555,"pressure":852.31,"sea_level":1028.34,"grnd_level":852.31,"humidity":68},"dt":1476599537,"wind":{"speed":0.76,"deg":225.502},"sys":{"country":"MX"},"clouds":{"all":0},"weather":[{"id":800,"main":"Clear","description":"Sky is Clear","icon":"01n"}]}
　　　　　　]
}

api.openweather