JavaScript模块化编程实例——天气预报
Posted 召唤师峡谷
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良好的习惯是成功的一半。今天总结一个javascript模块化编程实例学习交流,这个例子是之前没有按照模块化概念来写的,今天把它按照AMD规范重新封装了一个js文件,主要实现天气预报数据的解析与地图绘制。天气API采用百度API集市提供的天气预报API。
1、weatherUtil.js
weatherUtil.js是解析天气预报数据模块,完成数据解析和图层绘制两个工作,代码如下,熟悉requirejs规范和基本js知识很容易理解。
define(['leaflet'], function()
/**
* 解析天气预报,返回每个城市天气描述对象
* @param weatherObj
* @returns city: *, cityLat: *, cityLon: (_options.lon|*|sdl_path.lon), temperature_now: (.copyState.tmp|*|tmp), temperature_max: *, temperature_min: *, weather_now: *
* @private
*/
function _parseWeather(weatherObj)
var aqi = weatherObj.aqi; //空气质量
var basic = weatherObj.basic;//城市信息
var now = weatherObj.now;//天气实况
var dailyForecast = weatherObj.daily_forecast;//逐日预报
var hourForecast = weatherObj.hourForecast;//3小时预报
var suggestion = weatherObj.suggestion;//生活指数
// basic:城市基本信息
var city = basic.city;
var cityLat = basic.lat;
var cityLon = basic.lon;
var update = basic.update;//更新时间
// aqi:空气质量指数
//var aqi_index = aqi.city.aqi;// 空气质量指数
//var pm25 = aqi.city.pm25;// PM2.5 1小时平均值(ug/m³)
//var qlty = aqi.city.qlty;// 空气质量类别
// 实况天气
var now_weather = now.cond.txt;
var fl = now.fl;// 体感温度
var wind_spd_now = now.wind.spd;// 风速(km/h)
var wind_sc_now = now.wind.sc;// 风力等级
var wind_deg_now = now.wind.deg;// 风向(角度)
var wind_dir_now = now.wind.dir;// 风向(方向)
var pcpn_now = now.pcpn;// 降雨量
var hum_now = now.hum;// 湿度(%)
var pres_now = now.pres;// 气压
var tmp_now = now.tmp;// 温度
var vis_now = now.vis;// 能见度
// 天气预报:dailyForecast
var day0 = dailyForecast[0];// 今天
var day_sr = day0.astro.sr;// 日出时间
var day_ss = day0.astro.ss;// 日落时间
var cond_day = day0.cond.txt_d;// 白天天气描述
var cond_night = day0.cond.txt_n;// 夜间天气描述
var tmp_max = day0.tmp.max;// 最高气温
var tmp_min = day0.tmp.min;// 最低气温
var wind_spd_day0 = day0.wind.spd;
var wind_sc_day0 = day0.wind.sc;
var wind_dir_day0 = day0.wind.dir;
return
city : city,//城市名称
cityLat : cityLat,//城市纬度
cityLon : cityLon,//城市经度
temperature_now : tmp_now,//当前温度
temperature_max : tmp_max,//今日最高温度
temperature_min : tmp_min,//今日最低温度
weather_now : now_weather//当前天气
;
/**
* 绘制天气标记
* @param array:天气预报数组
* @returns *:天气预报图层
* @private
*/
function _drawWeatherMarker(array)
var layer = L.LayerGroup.collision(margin : 10);
array.forEach(function(obj)
var weatherIcon = L.icon(
iconUrl : _getIconUrl(obj.weather_now),
iconSize : [32, 32],
iconAnchor : [0, 0],
popupAnchor : [12, 7]
);
var marker = L.marker(L.latLng(obj.cityLat, obj.cityLon),
icon : weatherIcon
).bindPopup("<h2>" + obj.city + "</h2>" + "</br>" + "<h2>" + obj.weather_now + "</h2>");
layer.addLayer(marker);
);
return layer;
;
/**
* 根据天气获取对应描述图片
* @param weather
* @returns *
* @private
*/
function _getIconUrl(weather)
var iconUrl;
switch(weather)
case '晴' :
iconUrl = 'images/weather/government/晴.png';
break;
case '多云' :
iconUrl = 'images/weather/government/多云.png';
break;
case '少云' :
iconUrl = 'images/weather/government/多云.png';
break;
case '晴间多云' :
iconUrl = 'images/weather/government/多云.png';
break;
case '阴' :
iconUrl = 'images/weather/government/阴.png';
break;
case '阵雨' :
iconUrl = 'images/weather/government/阵雨.png';
break;
case '强阵雨' :
iconUrl = 'images/weather/government/阵雨.png';
break;
case '雷阵雨' :
iconUrl = 'images/weather/government/雷阵雨.png';
break;
case '强雷阵雨' :
iconUrl = 'images/weather/government/雷阵雨.png';
break;
case '雷阵雨伴有冰雹' :
iconUrl = 'images/weather/government/雷阵雨伴有冰雹.png';
break;
case '小雨' :
iconUrl = 'images/weather/government/小雨.png';
break;
case '中雨' :
iconUrl = 'images/weather/government/中雨.png';
break;
case '大雨' :
iconUrl = 'images/weather/government/大雨.png';
break;
case '极端降雨' :
iconUrl = 'images/weather/government/大雨.png';
break;
case '毛毛雨/细雨' :
iconUrl = 'images/weather/government/小雨.png';
break;
case '暴雨' :
iconUrl = 'images/weather/government/暴雨.png';
break;
case '大暴雨' :
iconUrl = 'images/weather/government/大暴雨.png';
break;
case '特大暴雨' :
iconUrl = 'images/weather/government/特大暴雨.png';
break;
case '冻雨' :
iconUrl = 'images/weather/government/冻雨.png';
break;
case '小雪' :
iconUrl = 'images/weather/government/小雪.png';
break;
case '中雪' :
iconUrl = 'images/weather/government/中雪.png';
break;
case '大雪' :
iconUrl = 'images/weather/government/大雪.png';
break;
case '暴雪' :
iconUrl = 'images/weather/government/暴雪.png';
break;
case '雨夹雪' :
iconUrl = 'images/weather/government/雨夹雪.png';
break;
case '雨雪天气' :
iconUrl = 'images/weather/government/雨夹雪.png';
break;
case '阵雨夹雪' :
iconUrl = 'images/weather/government/雨夹雪.png';
break;
case '阵雪' :
iconUrl = 'images/weather/government/阵雪.png';
break;
case '薄雾' :
iconUrl = 'images/weather/government/雾.png';
break;
case '雾' :
iconUrl = 'images/weather/government/雾.png';
break;
case '霾' :
iconUrl = 'images/weather/government/霾.png';
break;
case '扬沙' :
iconUrl = 'images/weather/government/扬沙.png';
break;
case '浮尘' :
iconUrl = 'images/weather/government/浮尘.png';
break;
case '沙尘暴' :
iconUrl = 'images/weather/government/强沙尘暴.png';
break;
case '强沙尘暴' :
iconUrl = 'images/weather/government/强沙尘暴.png';
break;
case '未知' :
iconUrl = 'images/weather/government/无.png';
break;
default :
iconUrl = 'images/weather/government/无.png';
break;
return iconUrl;
/**
* 封装
*/
return
parseWeather : _parseWeather,
drawWeatherMarker : _drawWeatherMarker
)
2、调用
main.js中调用如下:
require(['jquery', 'weatherUtil'], function($, weatherUtil)
//加载天气预报
$.ajax(
url : webRoot + "/servlet/getWeather",
type : 'get',
dataType : 'json',
async : true,
success : function(result)
//解析天气预报数据
var array = [];
result.forEach(function(obj)
var weatherInd = obj['HeWeather data service 3.0'][0];
array.push(weatherUtil.parseWeather(weatherInd));
);
//绘制天气标记
var weatherLayer = weatherUtil.drawWeatherMarker(array).addTo(mainmap);
layerControl.addOverlay(weatherLayer, '江西省天气预报');
,
failure : function(data)
)
);
3、实现效果
实现效果如下图所示,另外使用了leaflet的聚合图层(即上述代码中的collision图层),避免了图标的堆叠。
目前,前端数据接入及可视化表达做的差不多了,后面应该多放精力在算法和模型上面了,每天坚持写代码2-4小时,看论文总结,看书总结。
4、总结
javascript模块化总结到现在为止了,这个过程中也加深了自己的理解,在以后的设计和编码中都要运用这种方法,带来的好处是显而易见的。推荐所有学习前端开发的以及想学习前端开发的都采用这种规范哈。最后,我自己总结的三篇文章链接:
[1] JavaScript模块化编程
[1] 深入理解JavaScript模块化编程:RequireJS
[3] JavaScript模块化编程实例——天气预报
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