首先分析需求，移动端实现天气查询。如果在没有给定地理位置的时候，那很简单，直接利用JSONP获取Open Weather API提供的一个接口，传个位置就好。这点我就不多说了，下面我要说的是，实现自动定位并获取天气。
首先要做准备工作：百度Map开发者的accesskey，OpenWeather开发者的accesskey。这个注册一下就可以免费试用，还是蛮良心的，哈哈。
现在开始第一步，首先我们要获取经纬度，这里博主用的是H5提供的一个api接口navigator.geolocation，当然也可以利用访问IP获取经纬度或城市，但是博主搜了很多，大部分不对外开放了
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var lat,lon,cityname=new Array;<br>function getLocation(){
if (navigator.geolocation)
{
navigator.geolocation.getCurrentPosition(showPosition);
}
else{x.innerHTML="Geolocation is not supported by this browser.";}
}
这里首先判断下浏览器对于api的支持，如果不支持GG思密达咯。在调用
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navigator.geolocation.getCurrentPosition这个函数后，我们会传入一个对象给showPosition这个函数，里面包含着经纬度
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function showPosition(position)
{
console.log(position.coords.latitude+"!!!"+position.coords.longitude)
lat=position.coords.latitude;
lon=position.coords.longitude;
//alert(lat+"!!"+lon);
// 百度地图API功能
//alert(lat+"!!"+lon);
var map = new BMap.Map("allmap");
var point = new BMap.Point(lon, lat);
map.centerAndZoom(point, 15);
var gc = new BMap.Geocoder();
gc.getLocation(point, function(rs){
var addComp = rs.addressComponents;
console.log(addComp.province + ", " + addComp.city + ", " + addComp.district + ", " + addComp.street + ", " + addComp.streetNumber);
$(".location").html("你所在的城市:"+addComp.city);
cityname=addComp.city.split("市");
});
var marker = new BMap.Marker(point); // 创建标注
map.addOverlay(marker); // 将标注添加到地图中
marker.setAnimation(BMAP_ANIMATION_BOUNCE); //跳动的动画
//天气模块
weather();
}
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console一下，方便看到我们得到的经纬度。有人会问，console只能在控制台看到啊，NONONO，Chrome inspect大家可以看下，支持手机端调试，博主有空也会稍微讲下inspect的，不过网上教程蛮多的，大家可以看看。实在不会，咱们可以alert对吧，哈哈......唔，扯偏了，咱们回到正题，得到经纬度后，咱们就需要调用baidu Map的api了，
传入咱们刚获取的lon，lat这时候就可以返回城市名等信息了。当然博主这边写的有点多，同时绘制了地图，大家可以适当删减。
ok，走到这步我们就可以开始伟大的旅行了，将我们拿到的cityname给我们可爱的Open weather提供的api
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//查询天气
function weather(){
var url="http://api.openweathermap.org/data/2.5/weather?q="+cityname[0]+"&callback=msg&appid=openweather的accesskey";
var scr=document.createElement('script');
scr.setAttribute('type','text/javascript');
scr.setAttribute('src',url);
document.getElementsByTagName('head')[0].appendChild(scr);
}
//回调函数
function msg(data){
var local_weather=data.weather[0].main;
var temp_max=parseInt(data.main.temp_max-273.13);
var temp_min=parseInt(data.main.temp_min-273.13);
$(".temp").html("温度："+temp_min+"℃-"+temp_max+"℃");
//alert("天气"+local_weather+"温度"+temp_min+"℃到"+temp_max+"℃");
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<script type="text/javascript" src="http://api.map.baidu.com/api?v=2.0&ak=你的百度Map accesskey"></script>
利用JSONP给我们的数据，我们就可以拿到天气了，当然博主这里提醒一下，返回的数据最好在pc端console一下，返回的json还是蛮复杂的，还有一点就是一定要在head里面加上上面百度api的url哦
当然最近听朋友说，百度提供了一个api市场，有更简单的天气api，大家有空可以去看看。互联网大牛不是吹的，哈哈。本来想贴上楼主的源码地址，但是楼主用的是sae，最近刚好赶上sae改革，流量贼贵，这里就只给大家提供一个思路了，有问题大家可以留言哦，看到的话，博主我会回复的
