一、准备工作

1、注册微信小程序

2、注册和风天气账号

3、注册百度地图开放平台（小程序应用）

4、在小程序设置中设置request合法域名

二、程序实现

项目代码截图：

具体实现如下：

1、前端页面的实现

<!--index.wxml-->
<image src="../../assets/day.jpg" class="bg"></image>
<view class="container">

  <view class="nowWeather">
    <view class="city w">{{city}} {{district}}</view>
    <view class="road w">{{street}}</view>
    <view class="temp w b">{{tmp}}°</view>
    <view class="weather w">{{txt}} | 空气 {{qlty}}</view>
  </view>

  <view class="weahterDetail">
    <view class="">
      <view class="w center">{{dir}}</view>
      <view wx:if="{{sc == '微风'}}" class="w b center f50">微风</view>
      <view wx:else class="w b center f50">{{sc}}级</view>
    </view>
    <view class="l"></view>
    <view class="">
      <view class="w center">相对湿度</view>
      <view class="w b center f50">{{hum}}%</view>
    </view>
    <view class="l"></view>
    <view class="">
      <view class="w center">体感温度</view>
      <view class="w b center f50">{{fl}}°</view>
    </view>
  </view>

</view>


<view wx:for="{{daily_forecast}}" wx:for-index="i" wx:for-item="item">
  <view class="hor forcast">
    <view class="center">{{day[i]}}</view>
    <view class="hor">
      <image class="img" src="../../assets/icons/{{item.cond.code_d}}.png"></image>
      <view class="center">{{item.cond.txt_d}}|{{qlty}}</view>
    </view>
    <view class="center">{{item.tmp.min}}°/ {{item.tmp.max}}°</view>
  </view>
</view>

2、css实现

/**index.wxss**/

/**common css**/
.w{
  color: white;
}
.b{
  font-weight: bold;
}

.l{
  border: 1rpx solid #fff;
}

.center{
  text-align: center;
  margin: auto 0;
}

.hor{
  display: flex;
}

.f50{
  font-size: 50rpx;
}

/**index css**/


.bg {
  width: 100%;
  height: 700rpx;
}

.temp{
  font-size: 170rpx;
}

.container {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  padding: 0;
  margin: 0;
  height: 700rpx;
  display: block;
}

.nowWeather{
  padding: 60rpx;
}

.weahterDetail{
  width: 100%;
  display: flex;
  flex-direction: row;
  justify-content: space-around;
  position: absolute;
  bottom: 50rpx;
}

.forcast{
  padding: 30rpx;
  margin-left: 16rpx;
  margin-right: 16rpx;
  border-bottom: 1rpx solid #eee;
  justify-content: space-around;
}

.img{
  width: 60rpx;
  height: 60rpx;
  margin-right: 16rpx;
}

3、js实现动态数据绑定

//index.js
//获取应用实例
var app = getApp()
var day = ["今天","明天","后天"];
Page({
  data: {
    day : day,
  },

  onLoad: function () {
    console.log('onLoad')
    var that = this

    that.getLocation();
  },

  //获取经纬度方法
  getLocation: function () {
    var that = this
    wx.getLocation({
      type: 'wgs84',
      success: function (res) {
        var latitude = res.latitude
        var longitude = res.longitude
        console.log("lat:" + latitude + " lon:" + longitude);

        that.getCity(latitude, longitude);
      }
    })
  },

  //获取城市信息
  getCity: function (latitude, longitude) {
    var that = this
    var url = "https://api.map.baidu.com/geocoder/v2/";
    var params = {
      ak: "1G50Crx5QIKWy5o4R5Q1ONFSgmFIxfIR",
      output: "json",
      location: latitude + "," + longitude
    }
    wx.request({
      url: url,
      data: params,
      success: function (res) {
        var city = res.data.result.addressComponent.city;
        var district = res.data.result.addressComponent.district;
        var street = res.data.result.addressComponent.street;

        that.setData({
          city: city,
          district: district,
          street: street,
        })

        var descCity = city.substring(0, city.length - 1);
        that.getWeahter(descCity);
      },
      fail: function (res) { },
      complete: function (res) { },
    })
  },

  //获取天气信息
  getWeahter: function (city) {
    var that = this
    var url = "https://free-api.heweather.com/v5/weather"
    var params = {
      city: city,
      key: "894fc2a749104d679fa022c3e71afe83"
    }
    wx.request({
      url: url,
      data: params,
      success: function (res) {
        var tmp = res.data.HeWeather5[0].now.tmp;
        var txt = res.data.HeWeather5[0].now.cond.txt;
        var code = res.data.HeWeather5[0].now.cond.code;
        var qlty = res.data.HeWeather5[0].aqi.city.qlty;
        var dir = res.data.HeWeather5[0].now.wind.dir;
        var sc = res.data.HeWeather5[0].now.wind.sc;
        var hum = res.data.HeWeather5[0].now.hum;
        var fl = res.data.HeWeather5[0].now.fl;
        var daily_forecast = res.data.HeWeather5[0].daily_forecast;
        that.setData({
          tmp: tmp,
          txt: txt,
          code: code,
          qlty: qlty,
          dir: dir,
          sc: sc,
          hum: hum,
          fl: fl,
          daily_forecast: daily_forecast
        })
      },
      fail: function (res) { },
      complete: function (res) { },
    })
  }

})

三、运行效果

导入到微信web开发者工具，运行即可：

运行后，界面如下：