现在有很多天气网站提供了免费或收费的api，如果每日访问量不高的话可以选择免费的，下面便是使用和风天气的api制作的一个显示当前地区当前时间的天气的网页，当然如果需要天气预报等也只需要从获取的json数组里提取就是了。

上图一张：

网页中加入当前天气（附代码）_html


界面比较简陋，重点只在于后台获取当前位置与当前天气。

获取当前经纬度代码如下

if(navigator.geolocation){
        navigator.geolocation.getCurrentPosition(function(position){
            lat = position.coords.latitude;     //维度
            lon = position.coords.longitude;    //经度
            });
     }

根据经纬度获取当前天气代码如下，免费注册后会获得一个免费的key，json格式请见官网。

var para = "https://free-api.heweather.com/v5/weather?city="+lon+","+lat+"&key=53153e2fed574ce19f5c089a1aacede0";
            console.log(para);
            $.getJSON(para,function(json){
                var city= json["HeWeather5"][0]["basic"]["city"];
                var cnty= json["HeWeather5"][0]["basic"]["cnty"];
                var weatherNow = json["HeWeather5"][0]["now"]["cond"]["txt"];
                degree=json["HeWeather5"][0]["now"]["tmp"];

最后放上完整代码：
html

<!DOCTYPE html>
<html >
<head>
  <meta charset="UTF-8">
  <title>local weather</title>
  <link rel='stylesheet prefetch' href='http://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css'>
      <link rel="stylesheet" href="css/style.css">


</head>

<body>

    <div class="container-fluid">
        <div class="content">
            <!-- <img src="http://file.digitaling.com/eImg/uimages/20150902/1441167475585128.gif"> -->
            <div class="city">
                <img src="img/Location.png">
                <div id="cityname" style="display: inline;">城市</div>
            </div>
            <div class="weather">天气</div>
            <div class="degree">
                <div class="tmp">30</div>
                <div class="tmp-kind">°C</div>
                <div class="tmp-change"><button class="btn-tmp-change btn btn-primary">Change °C or °F</button></div>
            </div>
            <div class="wind">北风3级</div>

        </div>
    </div>

    <script src='http://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js'></script>
    <script src="js/index.js"></script>

</body>
</html>

css

*{
    margin:0;
    padding:0;
}

body{
    overflow:none;
    background: url("https://images.unsplash.com/photo-1465311530779-5241f5a29892?dpr=1&auto=format&fit=crop&w=1500&h=1000&q=80&cs=tinysrgb&crop=") no-repeat center center fixed;
    background-size: cover;
}

/*
    雷电：https://images.unsplash.com/photo-1431440869543-efaf3388c585?dpr=1&auto=format&fit=crop&w=1500&h=1000&q=80&cs=tinysrgb&crop=
    雪：https://images.unsplash.com/photo-1483119624769-b1a73c256500?dpr=1&auto=format&fit=crop&w=1080&h=724&q=80&cs=tinysrgb&crop=
    太阳：https://images.unsplash.com/photo-1472752112832-519166b23dfa?dpr=1&auto=format&fit=crop&w=1080&h=720&q=80&cs=tinysrgb&crop=
    雨：https://images.unsplash.com/photo-1417008914239-59b898b49382?dpr=1&auto=format&fit=crop&w=1080&h=708&q=80&cs=tinysrgb&crop=
*/

.content{
    position: absolute;
    margin-top: 10%;
    margin-left: 20%;
    margin-right: 20%;
    width: 60%;

}
.city{
    text-align: center;
}
.city>img{
    width: 30px;
}
.city>div{
    font-size: 28px;
    vertical-align: middle;
    color: rgb(255,102,102);
}
.weather{
    text-align: center;
    color: rgb(255,102,102);
    font-size: 38px;
}
.degree{
    text-align: center;
    color: rgb(255,102,102);
    font-size: 38px;
}
.degree div{
    display: inline;
}
.degree .tmp-kind{
    margin-left: 10px;
}
.degree .tmp-change{
    margin-left: 30px;
}
.wind{
    text-align: center;
    color: rgb(255,102,102);
    font-size: 38px;
}

js

$(document).ready(function(){
    var lat,lon;
    var degree;     //摄氏度
    var tmpShow;    //显示的温度，因为有摄氏与华氏度的转换

    if(navigator.geolocation){
        navigator.geolocation.getCurrentPosition(function(position){
            lat = position.coords.latitude;
            lon = position.coords.longitude;
            console.log(lat+"  "+lon);

            var para = "https://free-api.heweather.com/v5/weather?city="+lon+","+lat+"&key=53153e2fed574ce19f5c089a1aacede0";
            console.log(para);
            $.getJSON(para,function(json){
                var city= json["HeWeather5"][0]["basic"]["city"];
                var cnty= json["HeWeather5"][0]["basic"]["cnty"];
                var weatherNow = json["HeWeather5"][0]["now"]["cond"]["txt"];
                degree=json["HeWeather5"][0]["now"]["tmp"];
                tmpShow = degree;

                var windShow = json["HeWeather5"][0]["now"]["wind"]["dir"]+" "+json["HeWeather5"][0]["now"]["wind"]["sc"]+"级";
                //console.log(city);
                $("#cityname").html(city+","+cnty);
                $('.weather').html(weatherNow);    
                $(".tmp").html(tmpShow);
                $(".wind").html(windShow);
            });
        });
    }

    $(".btn-tmp-change").on("click",function(){
        console.log($(".tmp").html());
        if(degree == $(".tmp").html()){
            $(".tmp").html(degree*1.8+32);
            $(".tmp-kind").html("°F");
            console.log(degree);
            console.log($(".tmp").html());
        }else{
            $(".tmp").html(degree);
            $(".tmp-kind").html("°C");
        }
    });

});