//调用jsonp函数请求当前所在城市

jsonp('https://api.map.baidu.com/api?v=2.0&ak=Dv1NMU23dh1sGS9n2tUouDEYY96Dfzh3&s=1&callback=getCity');

window.onload=function(){

    //请求天气车数据

    btn.onclick=function (){

        jsonp(createUrl());

    }

};

function getCity(){

    function city(result){

        jsonp(createUrl(result.name));

    }

    var cityName = new BMap.LocalCity();

    cityName.get(city);

}

// 数据请求函数

function jsonp(url){

    var script = document.createElement('script');

    script.src = url;

    document.body.insertBefore(script, document.body.firstChild);

    document.body.removeChild(script);

}

//数据请求成功回调函数，用于将获取到的数据放入页面相应位置

function getWeather(response) {

    var oSpan = document.getElementsByClassName('info');

    var data = response.result.data;

    oSpan[0].innerHTML=data.realtime.city_name;

    oSpan[1].innerHTML=data.realtime.date;

    oSpan[2].innerHTML='星期'+data.weather[0].week;

    oSpan[3].innerHTML=data.realtime.weather.info;

    oSpan[4].innerHTML=data.realtime.weather.temperature+'℃';

    oSpan[5].innerHTML=data.realtime.wind.direct;

    oSpan[6].innerHTML=data.realtime.weather.humidity+'%';

    oSpan[7].innerHTML=data.realtime.time;

    oSpan[8].innerHTML=data.life.info.ziwaixian[0];

    oSpan[9].innerHTML=data.life.info.xiche[0];

    oSpan[10].innerHTML=data.life.info.kongtiao[0];

    oSpan[11].innerHTML=data.life.info.chuanyi[0];

    var aDiv = document.getElementsByClassName('future_box');

    for(var i=0; i<aDiv.length; i++){

        var aSpan = aDiv[i].getElementsByClassName('future_info');

        aSpan[0].innerHTML = data.weather[i].date;

        aSpan[1].innerHTML = '星期'+data.weather[i].week;

        aSpan[2].innerHTML =data.weather[i].info.day[1];

        aSpan[3].innerHTML = data.weather[i].info.day[2]+'℃';

    }

    changeImg(response);

}

//根据获取到的数据更改页面中相应的图片

function changeImg(data){

    var firstImg = document.getElementsByTagName("img")[0];

    var firstWeatherId=data.result.data.realtime.weather.img;

    chooseImg(firstWeatherId,firstImg);

    var aImg = document.getElementById('future_container').getElementsByTagName('img');

    for(var j=0; j<aImg.length; j++){

        var weatherId = data.result.data.weather[j].info.day[0];

        chooseImg(weatherId,aImg[j]);

    }

}

//选择图片

function chooseImg(id,index){

    switch(id){

        case '0':

            index.src='images/weather_icon/1.png';

            break;

        case '1':

            index.src='images/weather_icon/2.png';

            break;

        case '2':

            index.src='images/weather_icon/3.png';

            break;

        case '3':

        case '7':

        case '8':

            index.src='images/weather_icon/4.png';

            break;

        case '6':

            index.src='images/weather_icon/6.png';

            break;

        case '13':

        case '14':

        case '15':

        case '16':

            index.src='images/weather_icon/5.png';

            break;

        case '33':

            index.src='images/weather_icon/7.png';

            break;

        default:

            index.src='images/weather_icon/8.png';

    }

}

//根据城市名创建请求数据及url

function createUrl(){

    var cityName = '';

    if(arguments.length == 0) {

        cityName = document.getElementById('text').value;

    }else{

        cityName = arguments[0];

    }

    var url = 'https://op.juhe.cn/onebox/weather/query?cityname=' + encodeURI(cityName) + '&key=1053d001421b886dcecf81a38422a1a2&callback=getWeather';

    return url;

}