微信小程序開發地圖定位。

微信小程序 剛剛公布沒多久，自己學習一下內容，以便以后的開發，想落后別人，這里做了一個簡單的小程序示例，大家可以參考下

要求要完成的功能：

1.要完成的要點是城市定位。

2.就是切換城市。

首頁我們先參照微信小程序開放的官方文檔找到：

在這里我們可以找到”當前位置經緯度“

getLocation: function (){　　var that = this wx.getLocation(　　{　　　　success: function (res) {　　　　　　　　 console.log(res)　　　　 that.setData({　　　　　　 hasLocation: true,　　　　　　 location: formatLocation(res.longitude, res.latitude)//這里是獲取經緯度　　　　})　　　　}　　})},

//將經緯度轉換成城市名和街道地址，參見百度地圖接口文檔：http://developer.baidu.com/map/index.php?title=webapi/guide/webservice-geocoding

onLoad: function (options) {　　console.log('onLoad')　　var that = this;　　wx.getLocation({　　　　success: function (res) {　　　　　　wx.request({　　　　　　　　url: 'http://api.map.baidu.com/geocoder/v2/?ak=btsVVWf0TM1zUBEbzFz6QqWF&callback=renderReverse&location=' + res.latitude + ',' + res.longitude + '&output=json&pois=1', data: { },　　　　　　　　header: { 'Content-Type': 'application/json' },　　　　　　　　success: function(ops) {　　　　　　　　　　console.log(ops.data)　　　　　　　　}　　　　})　　// console.log(res)　　// that.setData({　　// hasLocation: true,　　// location: formatLocation(res.longitude, res.latitude)　　// })　　}})}

這里用到微信小程序的文檔里面有發起的是https請求

這里面有案例我就不多講解：

上面的代碼打印出來的數據是：

renderReverse&&renderReverse(
{"status":0,
"result":
{"location":{"lng":114.05786799999997,"lat":22.543098999645019},
"formatted_address":"廣東省深圳市福田區福華一路138-5",
"business":"購物公園,新洲,香蜜湖",
"addressComponent":{"country":"中國","country_code":0,"province":"廣東省","city":"深圳市","district":"福田區","adcode":"440304","street":"福華一路","street_number":"138-5","direction":"附近","distance":"18"},"pois":[{"addr":"深圳市福田區福華一路138號","cp":" ","direction":"北","distance":"51","name":"深圳國際商會大廈","poiType":"房地產","point":{"x":114.05776971981998,"y":22.54267931627966},"tag":"房地產;寫字樓","tel":"","uid":"9ed8fd9034cebefaeb12e42c","zip":""},{"addr":"福華一路98號","cp":" ","direction":"南","distance":"60","name":"卓越大廈","poiType":"房地產","point":{"x":114.05777870287507,"y":22.543597255274773},"tag":"房地產;寫字樓","tel":"","uid":"c7fb04bd8fb44d68fb0cad85","zip":""},{"addr":"深圳市福田區","cp":" ","direction":"西北","distance":"236","name":"購物公園","poiType":"購物","point":{"x":114.05972802583108,"y":22.54214523984097},"tag":"購物;購物中心","tel":"","uid":"0e082dd9db526730aecb66f9","zip":""},{"addr":"福華一路南側","cp":" ","direction":"西北","distance":"123","name":"投行大廈","poiType":"房地產","point":{"x":114.05829972007068,"y":22.54214523984097},"tag":"房地產;寫字樓","tel":"","uid":"b3a40a67bedbe7782fb17ea0","zip":""},{"addr":"深圳福田區國際商會大廈A座","cp":" ","direction":"東北","distance":"77","name":"深圳國際商會大廈A座","poiType":"房地產","point":{"x":114.05750022816707,"y":22.54255414230188},"tag":"房地產;寫字樓","tel":"","uid":"108ed554a3f5358229fc4892","zip":""},{"addr":"福華一路88號","cp":" ","direction":"西","distance":"131","name":"中心商務大廈","poiType":"房地產","point":{"x":114.05899141531315,"y":22.54275442061121},"tag":"房地產;寫字樓","tel":"","uid":"cac5fc76d0304d8e2db96d8b","zip":""},{"addr":"深圳市福田區福華一路88號中心商務大廈首層","cp":" ","direction":"西","distance":"134","name":"招商銀行(中央商務支行)","poiType":"金融","point":{"x":114.05900039836824,"y":22.542704351061439},"tag":"金融;銀行","tel":"","uid":"c7fb04bd3d531f6bfa0cadef","zip":""},{"addr":"深圳福田中心區福華一路28號(投資大廈旁)","cp":" ","direction":"西","distance":"229","name":"深圳馬哥孛羅好日子酒店","poiType":"酒店","point":{"x":114.05991666998811,"y":22.54288793932078},"tag":"酒店;星級酒店","tel":"","uid":"0523a14106ceb804b23c8142","zip":""},{"addr":"福華一路208號購物公園B1層","cp":" ","direction":"西北","distance":"234","name":"永旺超市(購物公園店)","poiType":"購物","point":{"x":114.05971904277598,"y":22.542170274720726},"tag":"購物;超市","tel":"","uid":"9884a864bb2c032af8dc85d1","zip":""},{"addr":"深圳市福田區深南大道4103號興業銀行大廈17-18層","cp":" ","direction":"西南","distance":"158","name":"深圳市公證處(一號路)","poiType":"政府機構","point":{"x":114.05857819477869,"y":22.54424815372944},"tag":"政府機構;公檢法機構","tel":"","uid":"765bf8daf4efd08cb45f1ec0","zip":""}],"poiRegions":[],"sematic_description":"深圳國際商會大廈北51米","cityCode":340}})

你找到city傳進去就可以了，

第二步切換城市：

在次找到我們的微信小程序的開發文檔里面有

picker

滾動選擇器，現支持三種選擇器，通過mode來區分，分別是普通選擇器，時間選擇器，日期選擇器，默認是普通選擇器。

普通選擇器：mode = selector

時間選擇器：mode = time

日期選擇器：mode = date

注意：開發工具暫時只支持mode = selector。

示例代碼：

<view class="section"> <view class="section__title">地區選擇器</view> <picker bindchange="bindPickerChange" value="{{index}}" range="{{array}}">  <view class="picker">   當前選擇：{{array[index]}}  </view> </picker></view><view class="section"> <view class="section__title">時間選擇器</view> <picker mode="time" value="{{time}}" start="09:01" end="21:01" bindchange="bindTimeChange">  <view class="picker">   當前選擇: {{time}}  </view> </picker></view><view class="section"> <view class="section__title">日期選擇器</view> <picker mode="date" value="{{date}}" start="2015-09-01" end="2017-09-01" bindchange="bindDateChange">  <view class="picker">   當前選擇: {{date}}  </view> </picker></view>Page({ data: {  array: ['美國', '中國', '巴西', '日本'],  index: 0,  date: '2016-09-01',  time: '12:01' }, bindPickerChange: function(e) {  console.log('picker發送選擇改變，攜帶值為', e.detail.value)  this.setData({   index: e.detail.value  }) }, bindDateChange: function(e) {  this.setData({   date: e.detail.value  }) }, bindTimeChange: function(e) {  this.setData({   time: e.detail.value  }) }})

<view class="fl">　　<text wx:if="{{ifture}}">{{cityname}}</text>　　<text wx:else> {{array[index]}} </text>　　<!--<view class="add-address"></view>-->　　<picker bindchange="bindPickerChange" value="{{index}}" range="{{array}}">　　<view class="add-address">　　切換城市　　</view>　　</picker></view >

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